diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 539b850..794639d 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -41,6 +41,10 @@ jobs:
           python -m py_compile $(find frame/devkit-utils -type f ! -name '*.*' ! -name LICENSE) frame/devkit-utils/devkit_utils/*.py
       - name: Server tests
         run: python -m unittest discover -s tests -v
+      - name: Linux Wireless Adapter doctor (read-only PC smoke)
+        run: |
+          python ui/frame_wireless_doctor.py --json > "$RUNNER_TEMP/linux-wireless-doctor.json"
+          python -c 'import json, os; from pathlib import Path; d=json.loads((Path(os.environ["RUNNER_TEMP"]) / "linux-wireless-doctor.json").read_text()); assert d["supported"] and d["selected"] is None and d["schema"] == 1'
       - name: App syntax
         run: node --check app/main.js && node --check app/build/make-icon.js && node --check app/build/fetch-deps.js && node --check app/preload.js && node --check app/install-link.js && node --check app/updater.js
       - name: App tests
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91ffdd8..cd1cffd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+- Add a Linux PC Wireless Adapter doctor in Settings and Devices, with a source
+  CLI and local JSON report. Select observed hardware without assuming Valve
+  IDs; inspect USB/interface presence, driver/module binding, udev/permissions,
+  rfkill, channel/band and network manager evidence. Missing evidence stays
+  unknown; all checks are read-only and never contact the Frame.
+  [Usage and verification limits](docs/linux-wireless-adapter-doctor.md).
+
 - Add Linux Tools → Steam desktop sharing: request `steam -pipewire` only after
   checking Steam is not running, or open KDE Application Permissions with
   instructions to revoke a verified Steam screen-sharing session manually. No
diff --git a/README.md b/README.md
index 8ed1a59..ec575b1 100644
--- a/README.md
+++ b/README.md
@@ -44,6 +44,9 @@ Live video of what the lenses show, or of the app panel in use, flat and still h
 **🔋 Battery and status**<br>
 Charge, charging watts and time left, storage, memory, temperature, Wi-Fi, and what's running.
 
+For PC-side USB, driver, radio and network manager evidence, use the
+[Linux Wireless Adapter doctor](docs/linux-wireless-adapter-doctor.md).
+
 For repeatable read-only battery, power-rail, temperature and fan measurements,
 use the [power and heat sampler](docs/power-and-heat.md).
 
diff --git a/docs/img/linux-wireless-doctor.png b/docs/img/linux-wireless-doctor.png
new file mode 100644
index 0000000..af5ea9f
Binary files /dev/null and b/docs/img/linux-wireless-doctor.png differ
diff --git a/docs/linux-wireless-adapter-doctor.md b/docs/linux-wireless-adapter-doctor.md
new file mode 100644
index 0000000..0db807b
--- /dev/null
+++ b/docs/linux-wireless-adapter-doctor.md
@@ -0,0 +1,118 @@
+# Linux Wireless Adapter doctor
+
+![Linux PC doctor before any checks run, with explicit hardware selection and read-only limits](img/linux-wireless-doctor.png)
+
+On the **Linux PC**, open **Settings → Linux Wireless Adapter doctor**, or
+**Devices & connection → Linux Wireless Adapter doctor**. It works without a
+connected headset. Choose **Read PC device inventory**, select the intended
+USB device or wireless interface, then **Check selected device**. Nothing runs
+until requested. Re-read the inventory after reconnecting a device.
+
+From a source checkout, the same collector is available without starting the
+app or its headset connection workers:
+
+```sh
+python3 ui/frame_wireless_doctor.py
+python3 ui/frame_wireless_doctor.py --device net:wlan0
+python3 ui/frame_wireless_doctor.py --device usb:1-2 --json > adapter-report.json
+```
+
+Use a selector actually listed on your PC. No device is selected automatically.
+All USB devices are included, including hubs and devices without a network
+interface. A product label, observed VID/PID, or a single available interface
+**does not identify Valve's adapter**. There is no trusted adapter ID table in
+this feature. Compare inventory before and after reconnecting the intended
+adapter when safe. For a USB device exposing multiple wireless interfaces,
+select the specific interface for radio/manager evidence.
+
+## Evidence and limits
+
+- **Presence and binding:** `/sys/bus/usb/devices` and `/sys/class/net` correlate
+  USB ancestry, wireless interfaces, driver links and module links. An absent
+  interface does not establish which driver should be installed. A missing
+  module link may mean a built-in driver. A bound driver does not prove Steam
+  streaming support.
+- **Permissions and udev:** `udevadm info --query=property` supplies a small
+  allowlist of driver, ID and tag fields. If available, the report includes USB
+  node mode, owner/group IDs and the current user's read/write access. Direct
+  USB access is not necessarily required by kernel networking; a restrictive
+  node alone is not diagnosed as the cause. No udev rules are installed or run.
+- **Radio blocks:** read-only WLAN rfkill sysfs entries are matched to the
+  selected interface's PHY name. An unrelated block cannot establish that
+  this adapter is blocked. Unavailable or unmatched entries remain unknown.
+- **Channel/band:** `iw dev IFACE info` provides the current channel and
+  frequency where reported; `iw phy PHY info` supplies enabled frequencies.
+  An idle interface may have no current channel. These observations do not
+  establish the channel used by a Steam streaming session, supported regions,
+  or the correct regulatory setting.
+- **Network managers:** visible `/proc/*/comm` process names show
+  NetworkManager, iwd and wpa_supplicant. `nmcli` reads only the selected
+  interface's general state, managed flag and driver. NetworkManager can use
+  iwd or wpa_supplicant as its backend, so coexistence is not itself a conflict.
+  If both backends are visible, the report suggests checking who owns this
+  exact interface. It does not claim a confirmed conflict or stop services.
+  Restricted process visibility and unverified backend ownership are explicit.
+
+Every command uses fixed read-only arguments, no shell, closed stdin and a
+three-second timeout. Optional tools are not installed automatically. Missing
+tools, denied reads, disappearing devices, and restricted VM/container hardware
+visibility remain unknown. A successful report is a snapshot, not a hardware
+health certificate. CLI exit 0 means collection is supported, not that the
+adapter works; unsupported platforms/headset-local mode return 2, as does an
+invalid/stale selector. JSON has schema version 1.
+
+The doctor never uses SSH, scans nearby Wi-Fi networks, opens a connection to
+the Frame, escalates privileges, loads drivers, changes security settings,
+changes channels, unblocks radios, changes network settings, or restarts
+services. Run it as your ordinary user, never with sudo. The app hides the
+entry on macOS, Windows and phone sessions; its API refuses collection in
+headset-local (`FRAME_LOCAL=1`) mode. The source CLI is intended only for the PC.
+
+Reports stay local unless you explicitly save, copy or share them. Exported
+fields include observed USB IDs/product labels, interface names, driver names
+and permission metadata. USB serials, Wi-Fi names, MAC/IP address fields,
+credentials, process arguments and raw command output are not exported. Review
+the report before posting it: hardware labels and local paths can identify
+parts of your setup.
+
+## Motivation and shipped comparison
+
+[The 23 October 2026 complaint](https://x.com/ExpressGinga81/status/2113457683143741720)
+says the Wi-Fi dongle does not work on Ubuntu/Kubuntu 26.04 while SteamVR works
+under Wayland. It supplies **no adapter VID/PID, driver, logs or established
+cause**. This feature helps gather that missing evidence; it does not claim to
+fix that complaint or certify Ubuntu/Kubuntu 26.04 support.
+
+Shipped **v0.4.18** has local network/gateway discovery in `frame_network.py`
+and headset connection management, but no local USB/driver/rfkill adapter
+report or adapter diagnostic UI. The existing `frame-doctor.sh` diagnoses the
+headset through SSH and is a different tool. This doctor never calls it.
+General SteamOS 3.9.5 / Frame OS 0.5.6 compatibility and OS backend transition
+notes are covered separately in
+[`docs/steamos-2026-10-compat.md`](https://github.com/saphid/frame-control/blob/9c7110c1f48d160b0fb3c3b9f658d4937bd2032d/docs/steamos-2026-10-compat.md)
+([PR #164](https://github.com/saphid/frame-control/pull/164)). Existing PC
+route/SSID diagnostics use NetworkManager's `nmcli` with an `iwgetid` SSID
+fallback, independently of whether NetworkManager uses wpa_supplicant (SteamOS
+3.9.5 new installs) or iwd (upgrades). This doctor reads actual PC evidence and
+does not infer a conflict, hardware identity or fix from those OS defaults.
+There is no adapter-specific device observation in that compatibility work.
+
+## Verification
+
+```sh
+python3 -m unittest discover -s tests -p test_wireless_doctor.py -v
+python3 -m unittest discover -s tests
+```
+
+Tests use an explicitly synthetic USB `1234:5678`, sysfs trees, command replies
+and loopback HTTP. They cover an unbound USB device, module binding, multiple
+interfaces, PHY-matched and unrelated rfkill entries, channel parsing, manager
+coexistence, missing/denied commands, stale/injected selectors, export field
+filtering, authentication and refusal to probe in headset-local mode. The
+HTTP tests instantiate the handler without starting headset workers.
+
+Linux host collection was exercised on kernel `6.8.0-139-generic`: an existing
+PC interface was visible with its `iwlwifi` binding and unblocked PHY; `iw` and
+`nmcli` were absent and reported as unavailable. This is **not a physical Steam
+Frame Wireless Adapter test**, an Ubuntu/Kubuntu 26.04 test, or a headset test.
+No Frame access is part of this work.
diff --git a/tests/page/wireless_doctor.mjs b/tests/page/wireless_doctor.mjs
new file mode 100644
index 0000000..607bdf5
--- /dev/null
+++ b/tests/page/wireless_doctor.mjs
@@ -0,0 +1,70 @@
+// Run the real doctor page script with a minimal DOM; no browser or hardware I/O.
+import assert from 'node:assert/strict';
+import {readFileSync} from 'node:fs';
+import vm from 'node:vm';
+class Element {
+  constructor(tag) { this.tagName = tag.toUpperCase(); this.children = []; this.value = ''; this.hidden = false; this.disabled = false; this.textContent = ''; }
+  append(...nodes) { this.children.push(...nodes); }
+  prepend(...nodes) { this.children.unshift(...nodes); }
+  replaceChildren(...nodes) { this.children = nodes; }
+  get firstChild() { return this.children[0]; }
+  get options() { return this.children; }
+}
+const ids = ['back','inventory','diagnose','device','message','results','json','reportSection','selection','download','copy'];
+const elements = Object.fromEntries(ids.map(id => [id,new Element(id === 'device' ? 'select' : 'div')]));
+const requests = [];
+let pending;
+const context = vm.createContext({
+  document:{getElementById:id=>elements[id],createElement:tag=>new Element(tag)},
+  URLSearchParams,location:{search:'?key=test-key'},
+  fetch:(path,options)=>{ requests.push({path,options}); return new Promise(resolve=>{pending=resolve;}); },
+  navigator:{clipboard:{writeText:async()=>{throw Error('clipboard denied');}}},
+});
+const source = readFileSync(new URL('../../ui/wireless-doctor.html',import.meta.url),'utf8');
+vm.runInContext(source.match(/<script>([\s\S]*)<\/script>/)[1],context);
+assert.equal(requests.length,0,'opening the page must not probe');
+assert.equal(elements.back.href,'/?key=test-key#devices');
+const fixture = {
+  schema:1,supported:true,selected:null,
+  usb:[{id:'usb:1-2',vid:'1234',pid:'5678',product:'<img src=x onerror=alert(1)>'}],
+  interfaces:[{id:'net:wlan0',name:'wlan0',usb:'usb:1-2',driver:'synthetic'}],
+  checks:[{id:'presence',title:'Presence',status:'ok',suggestion:'Select hardware',evidence:['Synthetic evidence']}]
+};
+let promise=elements.inventory.onclick();
+assert.equal(elements.device.disabled,true,'selection must stay fixed during a read');
+assert.equal(requests[0].path,'/api/wireless-doctor');
+assert.equal(requests[0].options.headers['X-Frame-UI'],'test-key');
+pending({ok:true,json:async()=>fixture}); await promise;
+assert.equal(elements.device.value,'','no automatic hardware choice');
+assert.equal(elements.diagnose.disabled,true);
+assert.equal(elements.device.options.length,3);
+assert.match(elements.device.options[2].textContent,/<img src=x/,'hardware labels must stay plain text');
+assert.equal(elements.device.options[2].children.length,0);
+assert.equal(elements.reportSection.hidden,false);
+assert.equal(elements.results.children.length,1);
+elements.device.value='net:wlan0'; elements.device.onchange();
+assert.equal(elements.diagnose.disabled,false);
+assert.equal(elements.results.children.length,0,'changing hardware clears the previous result');
+assert.equal(elements.reportSection.hidden,true,'cannot export an old report for a new selection');
+promise=elements.diagnose.onclick();
+assert.equal(requests[1].path,'/api/wireless-doctor?device=net%3Awlan0');
+assert.equal(elements.device.disabled,true);
+pending({ok:true,json:async()=>({...fixture,selected:'net:wlan0'})}); await promise;
+assert.equal(elements.device.value,'net:wlan0');
+assert.equal(elements.device.disabled,false);
+await elements.copy.onclick();
+assert.match(elements.message.textContent,/Clipboard unavailable/);
+promise=elements.diagnose.onclick();
+assert.equal(elements.results.children.length,0,'clear a healthy snapshot before retrying');
+assert.equal(elements.reportSection.hidden,true);
+pending({ok:false,json:async()=>({error:'Device is no longer present. Refresh and select an observed device.'})}); await promise;
+assert.match(elements.message.textContent,/no longer present/);
+assert.equal(elements.results.children.length,0);
+assert.equal(elements.reportSection.hidden,true,'failed requests cannot export stale success');
+assert.equal(elements.inventory.disabled,false,'can refresh after failure');
+promise=elements.inventory.onclick();
+pending({ok:true,json:async()=>({...fixture,supported:false,usb:[],interfaces:[]})}); await promise;
+assert.equal(elements.selection.hidden,true);
+assert.equal(elements.diagnose.disabled,true);
+assert.match(elements.message.textContent,/only on a Linux PC/);
+console.log('doctor UI: on-demand reads, explicit selection, safe labels, stale report clearing and failure recovery passed');
diff --git a/tests/test_wireless_doctor.py b/tests/test_wireless_doctor.py
new file mode 100644
index 0000000..0b41596
--- /dev/null
+++ b/tests/test_wireless_doctor.py
@@ -0,0 +1,287 @@
+"""Synthetic sysfs fixtures and loopback HTTP; never require an adapter or a Frame."""
+import sandbox  # noqa: F401
+import contextlib
+import http.client
+import io
+import json
+import os
+import shutil
+from pathlib import Path
+import subprocess
+import sys
+import tempfile
+import threading
+import unittest
+from unittest.mock import patch
+
+sys.path.insert(0, str(Path(__file__).resolve().parent.parent / 'ui'))
+import frame_wireless_doctor as wd
+
+
+class Parsers(unittest.TestCase):
+    def test_channel_without_leaking_identifiers(self):
+        for frequency, band, channel in [(2412, '2.4 GHz', 1), (5180, '5 GHz', 36), (5975, '6 GHz', 5)]:
+            text = f'Interface wlan0\n addr aa:bb:cc:dd:ee:ff\n ssid private\n channel {channel} ({frequency} MHz), width: 80 MHz'
+            self.assertEqual(wd.radio_info(text), dict(channel=channel, frequency_mhz=frequency, band=band))
+        self.assertIsNone(wd.radio_info('Interface wlan0\n type managed\n'))
+        self.assertEqual(wd.supported_frequencies('* 2412 MHz [1] (20.0 dBm)\n* 5975 MHz [5] (disabled)\n* 5180 MHz [36] (23.0 dBm)'), [2412, 5180])
+
+    def test_non_linux_and_headset_mode_do_not_read_or_run(self):
+        for kwargs in ({'system': 'darwin'}, {'system': 'win32'}, {'system': 'linux', 'local': True}):
+            with patch.object(wd, 'Reader', side_effect=AssertionError('must not probe')):
+                self.assertFalse(wd.diagnose(**kwargs)['supported'])
+        with patch.dict(os.environ, {'FRAME_LOCAL': '1'}), patch.object(wd, 'Reader') as reader:
+            self.assertFalse(wd.diagnose(system='linux')['supported'])
+            reader.assert_not_called()
+
+    def test_command_failure_is_not_empty_success(self):
+        reader = wd.Reader()
+        for error, status in [(FileNotFoundError(), 'missing'), (PermissionError(), 'unavailable'),
+                              (subprocess.TimeoutExpired('iw', 3), 'timeout')]:
+            with patch.object(wd.subprocess, 'run', side_effect=error):
+                self.assertEqual(reader.command(['iw', 'dev', 'wlan0', 'info'])['status'], status)
+        with patch.object(wd.subprocess, 'run', return_value=subprocess.CompletedProcess([], 1, '', 'Operation not permitted')) as run:
+            result = reader.command(['iw', 'dev', 'wlan0', 'info'])
+            self.assertEqual(result['status'], 'denied')
+            self.assertEqual(result['text'], '')
+            self.assertEqual(run.call_args.kwargs['stdin'], subprocess.DEVNULL)
+            self.assertEqual(run.call_args.kwargs['timeout'], 3)
+            self.assertNotIn('shell', run.call_args.kwargs)
+
+    def test_read_failure_and_empty_inventory_remain_unknown(self):
+        with tempfile.TemporaryDirectory() as root:
+            reader = wd.Reader(root, root, root)
+            report = wd.diagnose(reader=reader, system='linux', local=False)
+        checks = {c['id']: c for c in report['checks']}
+        self.assertEqual(checks['presence']['status'], 'unknown')
+        self.assertIn('reads', checks)
+        with patch.object(Path, 'open', side_effect=PermissionError()):
+            self.assertIsNone(reader.read(Path('/synthetic/denied')))
+        self.assertIn('PermissionError', reader.gaps[-1])
+
+
+class Page(unittest.TestCase):
+    @unittest.skipUnless(shutil.which('node'), 'Node is needed for real page script checks')
+    def test_on_demand_selection_and_failure_recovery(self):
+        result = subprocess.run(['node', str(Path(__file__).parent / 'page/wireless_doctor.mjs')],
+                                capture_output=True, text=True, timeout=20)
+        self.assertEqual(result.returncode, 0, result.stdout + result.stderr)
+
+
+class FixtureReader(wd.Reader):
+    """Invented USB 1234:5678; it is deliberately not a claimed Valve ID."""
+    def __init__(self, root):
+        super().__init__(root / 'sys', root / 'dev', root / 'proc')
+        self.commands = []
+        self.responses = {}
+
+    def command(self, argv):
+        self.commands.append(argv)
+        return self.responses.get(argv[0], {'status': 'missing', 'detail': argv[0] + ' is not installed', 'text': ''})
+
+
+@unittest.skipUnless(sys.platform == 'linux', 'Linux sysfs symlink fixture')
+class LinuxEvidence(unittest.TestCase):
+    def setUp(self):
+        self.tmp = tempfile.TemporaryDirectory()
+        self.addCleanup(self.tmp.cleanup)
+        self.root = Path(self.tmp.name)
+        self.r = FixtureReader(self.root)
+        self.usb = self.r.sysfs / 'devices/pci0000:00/usb1/1-2'
+        for name, content in {'idVendor': '1234', 'idProduct': '5678', 'product': 'Synthetic adapter', 'busnum': '1', 'devnum': '2'}.items():
+            self.write(self.usb / name, content)
+        bus = self.r.sysfs / 'bus/usb/devices'
+        bus.mkdir(parents=True)
+        (bus / '1-2').symlink_to(self.usb, target_is_directory=True)
+        (self.r.sysfs / 'class/net').mkdir(parents=True)
+        (self.r.sysfs / 'class/rfkill').mkdir(parents=True)
+        self.r.proc.mkdir(parents=True)
+        self.write(self.r.dev / 'bus/usb/001/002', '')
+
+    def write(self, path, text):
+        path.parent.mkdir(parents=True, exist_ok=True)
+        path.write_text(text)
+
+    def nic(self, name='wlan0', index=0, driver=True):
+        device = self.usb / f'1-2:1.{index}'
+        device.mkdir(parents=True, exist_ok=True)
+        net = self.r.sysfs / 'class/net' / name
+        net.mkdir()
+        (net / 'device').symlink_to(device, target_is_directory=True)
+        (net / 'wireless').mkdir()
+        self.write(net / 'operstate', 'down')
+        phy = self.r.sysfs / f'devices/ieee80211/phy{index}'
+        phy.mkdir(parents=True)
+        (net / 'phy80211').symlink_to(phy, target_is_directory=True)
+        if driver:
+            binding = self.r.sysfs / 'bus/usb/drivers/synthetic_driver'
+            binding.mkdir(parents=True, exist_ok=True)
+            module = self.r.sysfs / 'module/synthetic_module'
+            module.mkdir(parents=True, exist_ok=True)
+            if not (binding / 'module').exists():
+                (binding / 'module').symlink_to(module, target_is_directory=True)
+            (device / 'driver').symlink_to(binding, target_is_directory=True)
+        return net
+
+    def report(self, device='usb:1-2'):
+        return wd.diagnose(device, reader=self.r, system='linux', local=False)
+
+    def checks(self, report):
+        return {c['id']: c for c in report['checks']}
+
+    def test_inventory_does_not_select_or_execute_commands(self):
+        self.nic()
+        report = self.report(None)
+        self.assertIsNone(report['selected'])
+        self.assertEqual(report['usb'][0]['interfaces'], ['net:wlan0'])
+        self.assertEqual(report['interfaces'][0]['usb'], 'usb:1-2')
+        self.assertIn('Unverified', report['identity'])
+        self.assertEqual(self.r.commands, [])
+
+    def test_nearest_usb_ancestor_wins_over_upstream_hub(self):
+        hub = self.usb.parent / '1-1'
+        hub.mkdir()
+        old = self.usb
+        self.usb = hub / old.name
+        old.rename(self.usb)
+        bus = self.r.sysfs / 'bus/usb/devices'
+        (bus / '1-2').unlink()
+        (bus / '1-2').symlink_to(self.usb, target_is_directory=True)
+        for name, content in {'idVendor': '4321', 'idProduct': '8765', 'busnum': '1', 'devnum': '1'}.items():
+            self.write(hub / name, content)
+        (bus / '1-1').symlink_to(hub, target_is_directory=True)
+        self.nic()
+        report = self.report(None)
+        self.assertEqual(report['interfaces'][0]['usb'], 'usb:1-2')
+        upstream_hub = next(d for d in report['usb'] if d['port'] == '1-1')
+        self.assertEqual(upstream_hub['interfaces'], [])
+
+    def test_unbound_usb_is_selectable_without_guessing_driver(self):
+        report = self.report()
+        checks = self.checks(report)
+        self.assertEqual(checks['binding']['status'], 'unknown')
+        self.assertIn('No wireless interface', checks['binding']['evidence'][0])
+        self.assertEqual(checks['channel']['status'], 'unknown')
+        self.assertNotIn('iw', [a[0] for a in self.r.commands])
+        self.assertIn('1234:5678', json.dumps(report))
+
+    def test_selected_radio_and_all_commands_are_read_only(self):
+        self.nic()
+        for key, value in {'type': 'wlan', 'name': 'phy0', 'soft': '1', 'hard': '0'}.items():
+            self.write(self.r.sysfs / 'class/rfkill/rfkill0' / key, value)
+        for pid, name in enumerate(('NetworkManager', 'iwd', 'wpa_supplicant'), 1):
+            self.write(self.r.proc / str(pid) / 'comm', name)
+        self.r.responses = {
+            'udevadm': dict(status='ok', detail='udevadm completed', text='ID_NET_DRIVER=synthetic_driver\nID_SERIAL=secret_serial\nTAGS=:uaccess:\n'),
+            'iw': dict(status='ok', detail='iw completed', text='channel 5 (5975 MHz)\naddr aa:bb:cc:dd:ee:ff\nssid private\n* 5975 MHz [5] (23.0 dBm)'),
+            'nmcli': dict(status='ok', detail='nmcli completed', text='30 (disconnected)\nyes\nsynthetic_driver\n')}
+        report = self.report('net:wlan0')
+        checks = self.checks(report)
+        self.assertEqual(checks['binding']['status'], 'ok')
+        self.assertIn('module=synthetic_module', checks['binding']['evidence'][0])
+        self.assertEqual(checks['rfkill']['status'], 'warning')
+        self.assertIn('6 GHz', json.dumps(checks['channel']))
+        self.assertIn('coexistence alone is not a conflict', checks['managers']['suggestion'])
+        self.assertIn('Both iwd and wpa_supplicant', checks['managers']['suggestion'])
+        for secret in ('secret_serial', 'aa:bb:cc:dd:ee:ff', 'ssid private'):
+            self.assertNotIn(secret, json.dumps(report))
+        self.assertEqual(self.r.commands, [
+            ['udevadm', 'info', '--query=property', '--path=' + str(self.r.sysfs / 'class/net/wlan0')],
+            ['iw', 'dev', 'wlan0', 'info'], ['iw', 'phy', 'phy0', 'info'],
+            ['nmcli', '-g', 'GENERAL.STATE,GENERAL.NM-MANAGED,GENERAL.DRIVER', 'device', 'show', 'wlan0']])
+
+    def test_unrelated_rfkill_and_missing_tools_are_not_healthy(self):
+        self.nic(driver=False)
+        for key, value in {'type': 'wlan', 'name': 'phy7', 'soft': '1', 'hard': '1'}.items():
+            self.write(self.r.sysfs / 'class/rfkill/rfkill7' / key, value)
+        checks = self.checks(self.report())
+        self.assertEqual(checks['binding']['status'], 'unknown')
+        self.assertEqual(checks['rfkill']['status'], 'unknown')
+        self.assertEqual(checks['permissions']['status'], 'unknown')
+        self.assertEqual(checks['channel']['status'], 'unknown')
+        self.r.responses['iw'] = dict(status='denied', detail='iw exited 1 (permission denied)', text='')
+        self.assertIn('permission denied', json.dumps(self.checks(self.report())['channel']))
+
+    def test_unmanaged_interface_does_not_trigger_a_network_repair(self):
+        self.nic()
+        self.r.responses['nmcli'] = dict(status='ok', detail='nmcli completed', text='10 (unmanaged)\nno\nsynthetic_driver\n')
+        check = self.checks(self.report())['managers']
+        self.assertIn('NetworkManager managed: no', check['evidence'])
+        self.assertIn('unmanaged alone is not a fault', check['suggestion'])
+        self.assertIn('Do not force management on', check['suggestion'])
+
+    def test_multiple_interfaces_require_explicit_interface(self):
+        self.nic()
+        self.nic('wlan1', 1)
+        checks = self.checks(self.report())
+        self.assertIn('interface-selection', checks)
+        self.assertEqual(checks['channel']['status'], 'unknown')
+        self.assertNotIn('iw', [a[0] for a in self.r.commands])
+        self.assertNotIn('interface-selection', self.checks(self.report('net:wlan1')))
+
+    def test_disappeared_or_injected_selector_is_rejected_before_commands(self):
+        for selector in ('net:missing', 'usb:../../etc', 'net:;sudo reboot', '', ['wlan0']):
+            with self.assertRaises(ValueError):
+                self.report(selector)
+        self.assertEqual(self.r.commands, [])
+
+    def test_cli_json_and_exit_contract(self):
+        with patch.object(wd, 'diagnose', return_value=self.report(None)), contextlib.redirect_stdout(io.StringIO()) as out:
+            self.assertEqual(wd.main(['--json']), 0)
+        self.assertEqual(json.loads(out.getvalue())['schema'], 1)
+        with patch.object(wd, 'diagnose', return_value={'supported': False}), contextlib.redirect_stdout(io.StringIO()):
+            self.assertEqual(wd.main(['--json']), 2)
+
+
+class HttpBoundary(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls):
+        import server
+        cls.server_module = server
+        # Serve the real handler only: main() would start unrelated headset workers.
+        cls.httpd = server.LoopbackServer(('127.0.0.1', 0), server.Handler)
+        cls.thread = threading.Thread(target=cls.httpd.serve_forever, daemon=True)
+        cls.thread.start()
+
+    @classmethod
+    def tearDownClass(cls):
+        cls.httpd.shutdown()
+        cls.httpd.server_close()
+        cls.thread.join()
+
+    def request(self, path, key=True):
+        conn = http.client.HTTPConnection('127.0.0.1', self.httpd.server_address[1], timeout=10)
+        headers = {'X-Frame-UI': self.server_module.UI_KEY} if key else {}
+        conn.request('GET', path, headers=headers)
+        response = conn.getresponse()
+        result = response.status, response.read()
+        conn.close()
+        return result
+
+    def test_auth_and_headset_independence(self):
+        with patch.object(self.server_module, 'ssh', side_effect=AssertionError('no SSH')), \
+                patch.object(self.server_module, 'working', side_effect=AssertionError('no headset lock')), \
+                patch.object(wd, 'diagnose', return_value={'supported': True, 'checks': []}) as probe:
+            self.assertEqual(self.request('/api/wireless-doctor', key=False)[0], 403)
+            probe.assert_not_called()
+            code, data = self.request('/api/wireless-doctor?device=net%3Awlan0')
+            self.assertEqual(code, 200)
+            self.assertTrue(json.loads(data)['supported'])
+            probe.assert_called_once_with('net:wlan0', local=self.server_module.LOCAL)
+
+    def test_local_mode_refuses_before_collection(self):
+        with patch.object(self.server_module, 'LOCAL', True), patch.object(wd, 'Reader', side_effect=AssertionError('no probes')):
+            code, body = self.request('/api/wireless-doctor')
+            self.assertEqual(code, 200)
+            self.assertFalse(json.loads(body)['supported'])
+
+    def test_stale_selection_is_bad_request_and_page_is_packaged(self):
+        with patch.object(wd, 'diagnose', side_effect=ValueError('Device is no longer present')):
+            self.assertEqual(self.request('/api/wireless-doctor?device=net:gone')[0], 400)
+        code, page = self.request('/wireless-doctor')
+        self.assertEqual(code, 200)
+        self.assertIn(b'No checks have run', page)
+        package = json.loads((Path(__file__).resolve().parent.parent / 'app/package.json').read_text())
+        filters = next(r['filter'] for r in package['build']['extraResources'] if r['from'] == '../ui')
+        self.assertIn('*.py', filters)
+        self.assertIn('*.html', filters)
diff --git a/ui/frame_wireless_doctor.py b/ui/frame_wireless_doctor.py
new file mode 100644
index 0000000..e6f833f
--- /dev/null
+++ b/ui/frame_wireless_doctor.py
@@ -0,0 +1,269 @@
+"""Read-only Linux PC Wireless Adapter doctor. No SSH, scans or repairs.
+
+Run on the PC: python3 ui/frame_wireless_doctor.py [--device net:wlan0] [--json]
+USB IDs are observations, never a claim that a device is Valve's adapter.
+"""
+import argparse
+from datetime import datetime, timezone
+import json
+import os
+from pathlib import Path
+import platform
+import re
+import stat
+import subprocess
+import sys
+
+
+class Reader:
+    """Bounded local reads; failures remain evidence rather than healthy defaults."""
+    def __init__(self, sysfs=Path('/sys'), dev=Path('/dev'), proc=Path('/proc')):
+        self.sysfs, self.dev, self.proc = Path(sysfs), Path(dev), Path(proc)
+        self.gaps = []
+
+    def read(self, path):
+        try:
+            with path.open(errors='replace') as source:
+                return source.read(4096).strip()
+        except OSError as exc:
+            self.gaps.append(f'{path}: {type(exc).__name__}')
+            return None
+
+    def entries(self, path):
+        try:
+            return sorted(path.iterdir())
+        except OSError as exc:
+            self.gaps.append(f'{path}: {type(exc).__name__}')
+            return []
+
+    def link(self, path):
+        try:
+            return path.resolve(strict=True).name
+        except OSError as exc:
+            if not isinstance(exc, FileNotFoundError):
+                self.gaps.append(f'{path}: {type(exc).__name__}')
+            return None
+
+    def command(self, argv):
+        try:
+            result = subprocess.run(argv, stdin=subprocess.DEVNULL, capture_output=True,
+                                    text=True, errors='replace', timeout=3,
+                                    env={**os.environ, 'LC_ALL': 'C'})
+        except FileNotFoundError:
+            return {'status': 'missing', 'detail': f'{argv[0]} is not installed', 'text': ''}
+        except subprocess.TimeoutExpired:
+            return {'status': 'timeout', 'detail': f'{argv[0]} timed out', 'text': ''}
+        except OSError as exc:
+            return {'status': 'unavailable', 'detail': f'{argv[0]}: {type(exc).__name__}', 'text': ''}
+        if result.returncode:
+            # Do not export command output that may contain SSIDs, MACs or other identifiers.
+            denied = bool(re.search(r'permission|not permitted|access denied', result.stderr, re.I))
+            return {'status': 'denied' if denied else 'unavailable',
+                    'detail': f'{argv[0]} exited {result.returncode}' + (' (permission denied)' if denied else ''),
+                    'text': ''}
+        return {'status': 'ok', 'detail': f'{argv[0]} completed', 'text': result.stdout[:131072]}
+
+
+def inventory(reader):
+    usb = []
+    for path in reader.entries(reader.sysfs / 'bus/usb/devices'):
+        # USB interface entries have no idVendor; inspect them under their parent below.
+        if ':' in path.name or not (path / 'idVendor').exists():
+            continue
+        vid, pid = reader.read(path / 'idVendor'), reader.read(path / 'idProduct')
+        bindings = []
+        for child in reader.entries(path):
+            if ':' in child.name:
+                bindings.append({'interface': child.name, 'driver': reader.link(child / 'driver'),
+                                 'module': reader.link(child / 'driver/module')})
+        usb.append({'id': 'usb:' + path.name, 'port': path.name, 'vid': vid, 'pid': pid,
+                    'product': reader.read(path / 'product') if (path / 'product').exists() else None,
+                    'bus': reader.read(path / 'busnum'), 'number': reader.read(path / 'devnum'),
+                    'bindings': bindings, 'interfaces': []})
+    interfaces = []
+    for path in reader.entries(reader.sysfs / 'class/net'):
+        if not ((path / 'wireless').exists() or (path / 'phy80211').exists()):
+            continue
+        try:
+            device_path = (path / 'device').resolve(strict=True)
+            ancestors = [device_path, *device_path.parents]
+        except OSError:
+            ancestors = []
+        # Nearest USB ancestor: a downstream adapter must not be attributed to its hub.
+        by_port = {d['port']: d for d in usb}
+        parent = next((by_port[p.name] for p in ancestors if p.name in by_port), None)
+        item = {'id': 'net:' + path.name, 'name': path.name,
+                'usb': parent['id'] if parent else None, 'phy': reader.link(path / 'phy80211'),
+                'driver': reader.link(path / 'device/driver'),
+                'module': reader.link(path / 'device/driver/module'),
+                'state': reader.read(path / 'operstate')}
+        interfaces.append(item)
+        if parent:
+            parent['interfaces'].append(item['id'])
+    return usb, interfaces
+
+
+def radio_info(text):
+    """Parse only channel facts; omit interface MAC, SSID and link identifiers."""
+    match = re.search(r'channel (\d+) \((\d+) MHz\)', text)
+    if not match:
+        return None
+    frequency = int(match[2])
+    band = '2.4 GHz' if 2400 <= frequency < 2500 else '5 GHz' if 4900 <= frequency < 5925 else '6 GHz' if 5925 <= frequency <= 7125 else 'other'
+    return {'channel': int(match[1]), 'frequency_mhz': frequency, 'band': band}
+
+
+def supported_frequencies(text):
+    return sorted(set(int(n) for n in re.findall(r'\* (\d+) MHz \[\d+\](?![^\n]*disabled)', text)))
+
+
+def diagnose(device=None, *, reader=None, system=None, local=None):
+    """Collect only on explicit request. The server calls this outside headset work."""
+    report = {'schema': 1, 'captured_at': datetime.now(timezone.utc).isoformat(), 'scope': 'Linux PC only; read-only', 'supported': False,
+              'identity': 'Unverified: select hardware by its observed USB port or network interface. '
+                          'No trusted Steam Frame Wireless Adapter VID/PID is assumed.',
+              'selected': device, 'usb': [], 'interfaces': [], 'checks': []}
+    def check(key, status, title, evidence, suggestion):
+        report['checks'].append(dict(id=key, status=status, title=title,
+                                     evidence=evidence, suggestion=suggestion))
+    if (system or sys.platform) != 'linux' or (os.environ.get('FRAME_LOCAL') == '1' if local is None else local):
+        check('platform', 'unknown', 'Linux PC required', [],
+              'Run this doctor on the Linux PC, not on the Frame or the phone server.')
+        return report
+    report.update(supported=True, kernel=platform.release())
+    r = reader or Reader()
+    usb, interfaces = inventory(r)
+    report.update(usb=usb, interfaces=interfaces)
+    items = usb + interfaces
+    selected = next((d for d in items if d['id'] == device), None)
+    if device is not None and selected is None:
+        raise ValueError('Device is no longer present. Refresh and select an observed device.')
+    check('presence', 'ok' if items else 'unknown', 'USB and wireless interface presence',
+          [f'{len(usb)} USB devices; {len(interfaces)} wireless interfaces visible in sysfs'],
+          'Select the intended adapter. USB presence alone does not establish wireless support.' if items else
+          'No candidates are visible. Check the PC USB connection and whether a VM/container hides hardware; this does not prove the adapter is absent.')
+    if selected is None:
+        check('selection', 'unknown', 'Hardware identity needs selection', [],
+              'Compare the inventory before and after reconnecting the adapter when safe. Select its USB port even if no network interface exists.')
+        if r.gaps:
+            check('reads', 'unknown', 'Some local evidence is unavailable', r.gaps,
+                  'Review unavailable paths locally; do not infer healthy hardware from missing evidence.')
+        return report
+    correlated = [d for d in interfaces if d['usb'] == device]
+    nic = selected if device.startswith('net:') else correlated[0] if len(correlated) == 1 else None
+    if len(correlated) > 1:
+        check('interface-selection', 'unknown', 'More than one wireless interface',
+              [d['id'] for d in correlated], 'Select a network interface for per-interface radio and ownership checks.')
+    parent = selected if device.startswith('usb:') else next((d for d in usb if d['id'] == selected['usb']), None)
+    names = [d['name'] for d in interfaces if parent and d['usb'] == parent['id']]
+    check('binding', 'ok' if nic and nic['driver'] else 'unknown', 'Driver and module binding',
+          ([f"{nic['name']}: driver={nic['driver'] or 'unavailable'}, module={nic['module'] or 'unavailable (possibly built in)'}, state={nic['state'] or 'unknown'}"] if nic else ['Multiple wireless interfaces are correlated; select one explicitly.' if len(correlated) > 1 else 'No wireless interface is correlated with this USB device.']) +
+          ([f"USB {parent['port']} observed ID {parent['vid']}:{parent['pid']}; wireless interfaces: {', '.join(names) or 'none'}"] +
+           [f"{b['interface']}: driver={b['driver'] or 'unbound'}, module={b['module'] or 'unavailable'}" for b in parent['bindings']] if parent else []),
+          'A bound driver does not prove streaming support. A missing module link can mean a built-in driver.' if nic and nic['driver'] else
+          'Check this observed device ID against your distribution/kernel and vendor documentation. No driver package or cause can be inferred; do not install a guessed driver or disable Secure Boot.')
+    path = r.sysfs / ('class/net/' + nic['name'] if nic else 'bus/usb/devices/' + parent['port'])
+    udev = r.command(['udevadm', 'info', '--query=property', '--path=' + str(path)])
+    properties = [line for line in udev['text'].splitlines() if line.split('=', 1)[0] in
+                  ('ID_NET_DRIVER', 'ID_USB_DRIVER', 'ID_VENDOR_ID', 'ID_MODEL_ID', 'TAGS', 'CURRENT_TAGS')]
+    access = []
+    if parent and (parent['bus'] or '').isdigit() and (parent['number'] or '').isdigit():
+        node = r.dev / f"bus/usb/{int(parent['bus']):03d}/{int(parent['number']):03d}"
+        try:
+            st = node.stat()
+            access.append(f'{node}: mode={stat.S_IMODE(st.st_mode):04o}, uid={st.st_uid}, gid={st.st_gid}, '
+                          f'user read={os.access(node, os.R_OK)}, write={os.access(node, os.W_OK)}')
+        except OSError as exc:
+            access.append(f'{node}: {type(exc).__name__}')
+    check('permissions', 'info' if udev['status'] == 'ok' else 'unknown', 'Permissions and udev evidence',
+          [udev['detail'], *properties, *access],
+          'USB node access is only an observation; kernel networking may not require direct USB access. '
+          'If Steam reports access denied for this exact device, compare the vendor/distribution udev guidance. Do not use broad chmod rules or run Steam as root.')
+    blocks = []
+    for entry in r.entries(r.sysfs / 'class/rfkill'):
+        if r.read(entry / 'type') != 'wlan':
+            continue
+        phy = r.read(entry / 'name')
+        blocks.append({'name': phy, 'soft': r.read(entry / 'soft'), 'hard': r.read(entry / 'hard'),
+                       'selected_phy': bool(nic and nic['phy'] and phy == nic['phy'])})
+    relevant = [b for b in blocks if b['selected_phy']]
+    blocked = any(b[k] == '1' for b in relevant for k in ('soft', 'hard'))
+    complete = relevant and all(b[k] in ('0', '1') for b in relevant for k in ('soft', 'hard'))
+    check('rfkill', 'warning' if blocked else 'ok' if complete else 'unknown', 'Radio blocks',
+          [f"{b['name']}: soft={b['soft']}, hard={b['hard']}, selected PHY={b['selected_phy']}" for b in blocks] or ['No readable WLAN rfkill entries.'],
+          'The selected PHY is blocked. Review the PC radio switch/airplane mode; a hard block may need a hardware switch.' if blocked else
+          'Only a matching PHY establishes this adapter’s rfkill state. Unrelated or unavailable entries do not rule out a radio block.')
+    if nic:
+        iw = r.command(['iw', 'dev', nic['name'], 'info'])
+        radio = radio_info(iw['text'])
+        frequencies = []
+        phy = nic['phy']
+        if phy and re.fullmatch(r'phy\d+', phy):
+            capabilities = r.command(['iw', 'phy', phy, 'info'])
+            frequencies = supported_frequencies(capabilities['text'])
+        else:
+            capabilities = {'detail': 'No PHY identifier available'}
+        check('channel', 'info' if radio else 'unknown', 'Current channel and band',
+              [iw['detail'], json.dumps(radio) if radio else 'No current channel reported.',
+               capabilities['detail'], f'Enabled frequencies reported by iw (MHz): {frequencies or "unavailable"}'],
+              'This is local radio evidence, not proof of the Steam streaming link or supported regions. '
+              'If no channel is reported the radio may be idle. Do not force a band, channel or regulatory country.')
+        nm = r.command(['nmcli', '-g', 'GENERAL.STATE,GENERAL.NM-MANAGED,GENERAL.DRIVER', 'device', 'show', nic['name']])
+        # These fields contain no SSIDs, addresses or credentials.
+        fields = nm['text'].strip().splitlines()[:3] if nm['status'] == 'ok' else []
+        nm_evidence = [f'{label}: {value}' for label, value in zip(
+            ('NetworkManager state', 'NetworkManager managed', 'NetworkManager driver'), fields)]
+        unmanaged = len(fields) > 1 and fields[1].lower() == 'no'
+    else:
+        nm = {'detail': 'No correlated wireless interface; per-interface ownership unavailable'}
+        nm_evidence = []
+        unmanaged = False
+        check('channel', 'unknown', 'Current channel and band', [], 'Select one correlated network interface to check channel/band.' if len(correlated) > 1 else 'No correlated wireless interface exists; channel/band cannot be determined.')
+    processes = set()
+    proc_entries = r.entries(r.proc)
+    for entry in proc_entries:
+        if entry.name.isdigit():
+            comm = r.read(entry / 'comm')
+            if comm in ('NetworkManager', 'iwd', 'wpa_supplicant'):
+                processes.add(comm)
+    check('managers', 'info' if proc_entries else 'unknown', 'Network manager coexistence',
+          [f'Visible processes: {", ".join(sorted(processes)) or "none"}', nm['detail'], *nm_evidence],
+          'NetworkManager commonly uses iwd or wpa_supplicant as its Wi-Fi backend; coexistence alone is not a conflict. '
+          + ('Both iwd and wpa_supplicant are visible. Check locally which service owns the selected interface before attributing a conflict; do not stop either automatically.' if {'iwd', 'wpa_supplicant'} <= processes else
+             'Per-interface ownership by iwd/wpa_supplicant is unverified. Process absence in a restricted /proc view is inconclusive.')
+          + (' NetworkManager reports this interface unmanaged. Steam or another service may own it; unmanaged alone is not a fault. Do not force management on.' if unmanaged else ''))
+    if r.gaps:
+        check('reads', 'unknown', 'Some local evidence is unavailable', r.gaps[:40],
+              'Review unavailable paths locally. Permission failures or disappearing devices are not evidence of an adapter fault; do not elevate this doctor.')
+    check('limits', 'info', 'What this report cannot establish', [],
+          'No physical adapter or Frame link test runs here. Firmware, USB stability under load, Steam support and the reported Ubuntu/Kubuntu 26.04 cause remain unverified. Review the report before sharing it.')
+    return report
+
+
+def main(argv=None):
+    parser = argparse.ArgumentParser(description=__doc__.splitlines()[0])
+    parser.add_argument('--device', help='observed selector, e.g. net:wlan0 or usb:1-2; omitted lists candidates')
+    parser.add_argument('--json', action='store_true', help='print structured local evidence; review before sharing')
+    args = parser.parse_args(argv)
+    try:
+        data = diagnose(args.device)
+    except ValueError as exc:
+        parser.error(str(exc))
+    if args.json:
+        print(json.dumps(data, indent=2, ensure_ascii=False))
+    else:
+        print(data['scope'] + '\n' + data['identity'])
+        for d in data['usb']:
+            print(f"  {d['id']}  {d['vid']}:{d['pid']}  {d['product'] or 'unnamed USB device'}")
+        for d in data['interfaces']:
+            print(f"  {d['id']}  USB={d['usb'] or 'not correlated'}  driver={d['driver'] or 'unknown'}")
+        for c in data['checks']:
+            print(f"\n[{c['status'].upper()}] {c['title']}")
+            for line in c['evidence']:
+                print('  ' + line)
+            print('  ' + c['suggestion'])
+    return 0 if data['supported'] else 2
+
+
+if __name__ == '__main__':
+    raise SystemExit(main())
diff --git a/ui/index.html b/ui/index.html
index 20bf3ed..5ff6fe1 100644
--- a/ui/index.html
+++ b/ui/index.html
@@ -1826,7 +1826,7 @@
   </div>
   <div class="page" data-page="settings">
     <div class="workspace-heading"><div><a href="#settings" id="settingsBack" class="workspace-link" hidden>← All settings</a><h1 id="settingsTitle">Settings</h1><p id="settingsSubtitle">Connection, headset controls and Frame Control preferences.</p></div></div>
-    <div id="settingsDirectory" class="quick-routes"><a href="#devices"><span>Devices &amp; connection</span><small>Connect a Frame or switch headsets</small></a><a href="#control"><span>Control Center</span><small>Live metrics and searchable controls</small></a><a href="#home"><span>Frame activity</span><small>Readiness, running apps and downloads</small></a><a href="#display"><span>App display &amp; reports</span><small>Resolution, scale and compatibility</small></a><a href="#artworkSettings"><span>Library artwork</span><small>Images and artwork sources</small></a><a href="#autoSync" id="syncLink"><span>Copy to this computer</span><small>New screenshots and clips, automatically</small></a><a href="#privacy"><span>Privacy &amp; updates</span><small>Sharing preferences and app updates</small></a><a href="#power"><span>Remote &amp; power</span><small>Remote access, sleep and restart</small></a></div>
+    <div id="settingsDirectory" class="quick-routes"><a id="wirelessDoctorSettings" href="/wireless-doctor" hidden><span>Linux Wireless Adapter doctor</span><small>Read-only checks on this PC</small></a><a href="#devices"><span>Devices &amp; connection</span><small>Connect a Frame or switch headsets</small></a><a href="#control"><span>Control Center</span><small>Live metrics and searchable controls</small></a><a href="#home"><span>Frame activity</span><small>Readiness, running apps and downloads</small></a><a href="#display"><span>App display &amp; reports</span><small>Resolution, scale and compatibility</small></a><a href="#artworkSettings"><span>Library artwork</span><small>Images and artwork sources</small></a><a href="#autoSync" id="syncLink"><span>Copy to this computer</span><small>New screenshots and clips, automatically</small></a><a href="#privacy"><span>Privacy &amp; updates</span><small>Sharing preferences and app updates</small></a><a href="#power"><span>Remote &amp; power</span><small>Remote access, sleep and restart</small></a></div>
     <div id="settingsWorkspace" hidden></div>
   </div>
 
@@ -1843,6 +1843,7 @@
       <div class="list" id="devList"><div class="sub">Loading…</div></div>
       <div class="hint">Frame Control talks to one headset at a time. Each can be reached at several addresses;
         it tries them all at once and uses the best one that answers on the network you're on.</div>
+      <p id="wirelessDoctorLink" hidden><a href="/wireless-doctor">Linux Wireless Adapter doctor ↗</a><br><span class="sub">Read-only PC checks; works without a connected Frame.</span></p>
       <h3 style="margin-top:22px">This computer's network</h3>
       <div id="netNow" class="sub">Checking…</div>
       <div class="row" style="margin-top:8px; flex-wrap:nowrap">
@@ -2151,6 +2152,11 @@ $("bottombar").onclick = () => {
 const HOST = { computer: "computer" };
 function applyHostWording(h) {
   Object.assign(HOST, h);
+  for (const id of ["wirelessDoctorSettings", "wirelessDoctorLink"]) {
+    $(id).hidden = !!h.mobile || h.os !== "Linux";
+    const link = $(id).tagName === "A" ? $(id) : $(id).querySelector("a");
+    link.href = "/wireless-doctor?key=" + encodeURIComponent(UI_KEY);
+  }
   window.frameControlCenter?.host(h);
   $("desktopBatteryComfort").hidden = !!h.mobile || !window.frameApp?.notify;
   // The iPhone app: the server runs on the Frame, and saving goes to the phone's Photos.
diff --git a/ui/server.py b/ui/server.py
index 389bb15..9d4be2d 100755
--- a/ui/server.py
+++ b/ui/server.py
@@ -74,6 +74,7 @@ import frame_touch  # noqa: E402
 import frame_webinstall  # noqa: E402
 import frame_vr  # noqa: E402
 import frame_utilities  # noqa: E402
+import frame_wireless_doctor  # noqa: E402
 import frame_compat_db  # noqa: E402
 
 frame_host.trust_bundled_cas()
@@ -3493,6 +3494,13 @@ class Handler(BaseHTTPRequestHandler):
             elif path == "/api/agent/approval":
                 token = (parse_qs(url.query).get("confirmation") or [""])[0]
                 self.send_json(frame_agent.approvals.inspect(token))
+            elif path == "/wireless-doctor":
+                self.send_bytes((HERE / "wireless-doctor.html").read_bytes(), "text/html; charset=utf-8")
+            elif path == "/api/wireless-doctor":
+                # PC-only and independent of LINK/working(): never start or wait for SSH.
+                args = parse_qs(url.query)
+                self.send_json(frame_wireless_doctor.diagnose(
+                    (args.get("device") or [None])[0], local=LOCAL))
             elif path == "/api/steam-pipewire":
                 self.send_json(steam_pipewire_state())
             elif path == "/api/host":
diff --git a/ui/wireless-doctor.html b/ui/wireless-doctor.html
new file mode 100644
index 0000000..3aea28f
--- /dev/null
+++ b/ui/wireless-doctor.html
@@ -0,0 +1,85 @@
+<!doctype html>
+<html lang="en">
+<head>
+<meta charset="utf-8"><meta name="viewport" content="width=device-width,initial-scale=1">
+<title>Linux Wireless Adapter doctor · Frame Control</title>
+<style>
+:root{color-scheme:dark;--bg:#101820;--card:#1b2838;--text:#e4edf5;--sub:#acbccb;--line:#3a5065;--blue:#66c0f4;--warn:#f0c67a}
+*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:16px/1.55 system-ui,sans-serif}main{max-width:960px;margin:auto;padding:32px 24px 64px}a{color:var(--blue)}h1{font-size:30px;line-height:1.2;margin:20px 0 12px}h2{font-size:19px;margin:0 0 10px}p{margin:8px 0 16px}.sub{color:var(--sub)}.badge{display:inline-block;font-size:12px;letter-spacing:.05em;text-transform:uppercase;color:var(--blue);margin-bottom:8px}section{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:22px;margin:18px 0}.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}button,select{font:inherit;min-height:44px;border:1px solid var(--line);border-radius:5px;padding:9px 14px;background:#263f54;color:var(--text)}button{cursor:pointer}button.primary{background:#205b81;border-color:var(--blue)}button:disabled{opacity:.5;cursor:default}select{max-width:100%;width:100%}label{display:block;margin:16px 0 6px}pre{font:13px/1.6 ui-monospace,monospace;white-space:pre-wrap;overflow-wrap:anywhere;background:#111d29;padding:14px;border-radius:5px}.status{font-size:12px;font-weight:700;text-transform:uppercase;margin-right:10px;color:var(--blue)}.warning .status{color:var(--warn)}.unknown .status{color:var(--sub)}#message{min-height:24px}summary{cursor:pointer;min-height:40px;overflow-wrap:anywhere}:focus-visible{outline:2px solid var(--blue);outline-offset:4px}[hidden]{display:none!important}@media(max-width:540px){main{padding:20px 16px}h1{font-size:25px}section{padding:16px}.row button{flex:1}}
+</style>
+</head>
+<body><main>
+<a id="back" href="/#devices">← Devices &amp; connection</a>
+<header><h1>Linux Wireless Adapter doctor</h1><span class="badge">This PC · Read-only · On demand</span>
+<p>Find what Linux can see before choosing a fix. This doctor reads local USB, driver, radio and network manager evidence. It does not connect to the Frame or change your system.</p></header>
+<section aria-labelledby="chooseTitle"><h2 id="chooseTitle">1. Find the adapter</h2>
+<p class="sub">The Steam Frame adapter’s hardware ID is unverified here. Nothing is selected automatically. All USB devices are listed so you can select one even when no wireless interface appears.</p>
+<button id="inventory" class="primary">Read PC device inventory</button>
+<div id="selection" hidden><label for="device">Select the device you want to check</label><select id="device"><option value="">Choose an observed device…</option></select>
+<p class="sub">Compare the list before and after reconnecting the adapter when safe. A USB name or ID alone does not confirm that it is Valve’s adapter.</p>
+<button id="diagnose" class="primary" disabled>Check selected device</button></div>
+<p id="message" role="status" aria-live="polite">No checks have run.</p></section>
+<div id="results" aria-live="polite"></div>
+<section id="reportSection" hidden aria-labelledby="reportTitle"><h2 id="reportTitle">Local evidence report</h2>
+<p class="sub">Review before sharing. The report includes observed USB IDs and product labels, interface names, driver names and local permission metadata. It excludes Wi-Fi names, MAC/IP addresses, USB serial numbers, credentials and raw command output.</p>
+<div class="row"><button id="download">Save JSON report</button><button id="copy">Copy JSON report</button></div>
+<details><summary>Review JSON</summary><pre id="json"></pre></details></section>
+<p class="sub">No repairs, root prompts, driver installs, security changes or network configuration changes. A clean report does not prove Steam streaming support or resolve the Ubuntu/Kubuntu 26.04 complaint.</p>
+</main>
+<script>
+'use strict';
+const $ = id => document.getElementById(id);
+const key = new URLSearchParams(location.search).get('key') || '1';
+$('back').href = '/?key=' + encodeURIComponent(key) + '#devices';
+let report = null;
+const make = (tag, text) => { const el = document.createElement(tag); el.textContent = text; return el; };
+function render(data) {
+  report = data;
+  $('json').textContent = JSON.stringify(data, null, 2);
+  $('reportSection').hidden = false;
+  $('results').replaceChildren();
+  for (const c of data.checks) {
+    const box = document.createElement('section'); box.className = c.status;
+    const title = make('h2', c.title); const status = make('span', c.status + ' · '); status.className = 'status'; title.prepend(status);
+    box.append(title, make('p', c.suggestion));
+    if (c.evidence.length) { const d = document.createElement('details'); d.append(make('summary', 'Show evidence'), make('pre', c.evidence.join('\n'))); box.append(d); }
+    $('results').append(box);
+  }
+}
+async function run(device) {
+  $('inventory').disabled = $('diagnose').disabled = $('device').disabled = true;
+  $('message').textContent = device ? 'Reading selected device evidence…' : 'Reading PC inventory…';
+  // Clear previous results first: a removed device or failed read must not leave a healthy old report.
+  report = null; $('results').replaceChildren(); $('reportSection').hidden = true;
+  try {
+    const response = await fetch('/api/wireless-doctor' + (device ? '?device=' + encodeURIComponent(device) : ''), {headers:{'X-Frame-UI':key}});
+    const data = await response.json(); if (!response.ok) throw new Error(data.error || 'Could not read local evidence');
+    render(data);
+    const select = $('device'); select.replaceChildren(make('option', 'Choose an observed device…')); select.firstChild.value = '';
+    for (const d of [...data.interfaces, ...data.usb]) {
+      const text = d.name ? `${d.id} · driver ${d.driver || 'unknown'} · ${d.usb || 'USB not correlated'}` : `${d.id} · ${d.vid || '?'}:${d.pid || '?'} · ${d.product || 'unnamed USB device'}`;
+      const option = make('option', text); option.value = d.id; select.append(option);
+    }
+    select.value = device || ''; $('selection').hidden = !data.supported || select.options.length < 2;
+    $('message').textContent = !data.supported ? 'Available only on a Linux PC.' : device ? 'Checks finished. Review evidence and limits below.' : 'Inventory read. Select the intended device to continue.';
+  } catch (e) { $('message').textContent = e.message; }
+  finally { $('inventory').disabled = $('device').disabled = false; $('diagnose').disabled = !$('device').value; }
+}
+$('inventory').onclick = () => run();
+$('device').onchange = () => {
+  report = null; $('results').replaceChildren(); $('reportSection').hidden = true;
+  $('diagnose').disabled = !$('device').value;
+  $('message').textContent = $('device').value ? 'Selection changed. Check this device for fresh evidence.' : 'Choose the intended device.';
+};
+$('diagnose').onclick = () => run($('device').value);
+$('download').onclick = () => {
+  if (!report) return;
+  const url = URL.createObjectURL(new Blob([JSON.stringify(report, null, 2) + '\n'], {type:'application/json'}));
+  const a = make('a', ''); a.href = url; a.download = 'linux-wireless-doctor.json'; a.click(); setTimeout(() => URL.revokeObjectURL(url), 1000);
+};
+$('copy').onclick = async () => {
+  if (!report) return;
+  try { await navigator.clipboard.writeText(JSON.stringify(report, null, 2)); $('message').textContent = 'Report copied. Review it before sharing.'; }
+  catch { $('message').textContent = 'Clipboard unavailable. Use Save JSON report or select the JSON below.'; }
+};
+</script></body></html>