diff --git a/src/xrt/auxiliary/util/u_device.c b/src/xrt/auxiliary/util/u_device.c
index 647dc76ff..bbcb627e9 100644
--- a/src/xrt/auxiliary/util/u_device.c
+++ b/src/xrt/auxiliary/util/u_device.c
@@ -451,7 +451,7 @@ u_device_get_view_pose(const struct xrt_vec3 *eye_relation, uint32_t view_index,
  *
  */
 
-void
+xrt_result_t
 u_device_get_view_poses(struct xrt_device *xdev,
                         const struct xrt_vec3 *default_eye_relation,
                         int64_t at_timestamp_ns,
@@ -460,7 +460,11 @@ u_device_get_view_poses(struct xrt_device *xdev,
                         struct xrt_fov *out_fovs,
                         struct xrt_pose *out_poses)
 {
-	xrt_device_get_tracked_pose(xdev, XRT_INPUT_GENERIC_HEAD_POSE, at_timestamp_ns, out_head_relation);
+	xrt_result_t xret =
+	    xrt_device_get_tracked_pose(xdev, XRT_INPUT_GENERIC_HEAD_POSE, at_timestamp_ns, out_head_relation);
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	for (uint32_t i = 0; i < view_count && i < ARRAY_SIZE(xdev->hmd->views); i++) {
 		out_fovs[i] = xdev->hmd->distortion.fov[i];
@@ -469,6 +473,8 @@ u_device_get_view_poses(struct xrt_device *xdev,
 	for (uint32_t i = 0; i < view_count; i++) {
 		u_device_get_view_pose(default_eye_relation, i, &out_poses[i]);
 	}
+
+	return XRT_SUCCESS;
 }
 
 xrt_result_t
@@ -521,7 +527,7 @@ u_device_ni_set_output(struct xrt_device *xdev, enum xrt_output_name name, const
 	E(get_hand_tracking);
 }
 
-void
+xrt_result_t
 u_device_ni_get_view_poses(struct xrt_device *xdev,
                            const struct xrt_vec3 *default_eye_relation,
                            int64_t at_timestamp_ns,
@@ -530,7 +536,8 @@ u_device_ni_get_view_poses(struct xrt_device *xdev,
                            struct xrt_fov *out_fovs,
                            struct xrt_pose *out_poses)
 {
-	E(get_hand_tracking);
+	E(get_view_poses);
+	return XRT_ERROR_NOT_IMPLEMENTED;
 }
 
 bool
diff --git a/src/xrt/auxiliary/util/u_device.h b/src/xrt/auxiliary/util/u_device.h
index 01110dd44..d55995b77 100644
--- a/src/xrt/auxiliary/util/u_device.h
+++ b/src/xrt/auxiliary/util/u_device.h
@@ -166,7 +166,7 @@ u_device_get_view_pose(const struct xrt_vec3 *eye_relation, uint32_t view_index,
  *
  * The field @ref xrt_device::hmd needs to be set and valid.
  */
-void
+xrt_result_t
 u_device_get_view_poses(struct xrt_device *xdev,
                         const struct xrt_vec3 *default_eye_relation,
                         int64_t at_timestamp_ns,
@@ -233,7 +233,7 @@ u_device_ni_set_output(struct xrt_device *xdev, enum xrt_output_name name, const
  *
  * @ingroup aux_util
  */
-void
+xrt_result_t
 u_device_ni_get_view_poses(struct xrt_device *xdev,
                            const struct xrt_vec3 *default_eye_relation,
                            int64_t at_timestamp_ns,
diff --git a/src/xrt/drivers/multi_wrapper/multi.c b/src/xrt/drivers/multi_wrapper/multi.c
index 127cbc23a..6e862c8a9 100644
--- a/src/xrt/drivers/multi_wrapper/multi.c
+++ b/src/xrt/drivers/multi_wrapper/multi.c
@@ -193,7 +193,7 @@ set_output(struct xrt_device *xdev, enum xrt_output_name name, const struct xrt_
 	xrt_device_set_output(target, name, value);
 }
 
-static void
+static xrt_result_t
 get_view_poses(struct xrt_device *xdev,
                const struct xrt_vec3 *default_eye_relation,
                int64_t at_timestamp_ns,
@@ -204,14 +204,17 @@ get_view_poses(struct xrt_device *xdev,
 {
 	struct multi_device *d = (struct multi_device *)xdev;
 	struct xrt_device *target = d->tracking_override.target;
-	xrt_device_get_view_poses(target, default_eye_relation, at_timestamp_ns, view_count, out_head_relation,
-	                          out_fovs, out_poses);
+	xrt_result_t xret = xrt_device_get_view_poses(target, default_eye_relation, at_timestamp_ns, view_count,
+	                                              out_head_relation, out_fovs, out_poses);
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	/*
 	 * Use xrt_device_ function to be sure it is exactly
 	 * like if the state-tracker called this function.
 	 */
-	xrt_device_get_tracked_pose(xdev, XRT_INPUT_GENERIC_HEAD_POSE, at_timestamp_ns, out_head_relation);
+	return xrt_device_get_tracked_pose(xdev, XRT_INPUT_GENERIC_HEAD_POSE, at_timestamp_ns, out_head_relation);
 }
 
 static bool
diff --git a/src/xrt/drivers/north_star/ns_hmd.c b/src/xrt/drivers/north_star/ns_hmd.c
index e168ad915..80dbbc698 100644
--- a/src/xrt/drivers/north_star/ns_hmd.c
+++ b/src/xrt/drivers/north_star/ns_hmd.c
@@ -385,7 +385,7 @@ ns_hmd_get_tracked_pose(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 ns_hmd_get_view_poses(struct xrt_device *xdev,
                       const struct xrt_vec3 *default_eye_relation,
                       int64_t at_timestamp_ns,
@@ -398,19 +398,24 @@ ns_hmd_get_view_poses(struct xrt_device *xdev,
 	NS_DEBUG(ns, "Called!");
 
 	// Use this to take care of most stuff, then fix up below.
-	u_device_get_view_poses(  //
-	    xdev,                 //
-	    default_eye_relation, //
-	    at_timestamp_ns,      //
-	    view_count,           //
-	    out_head_relation,    //
-	    out_fovs,             //
-	    out_poses);           //
+	xrt_result_t xret = u_device_get_view_poses( //
+	    xdev,                                    //
+	    default_eye_relation,                    //
+	    at_timestamp_ns,                         //
+	    view_count,                              //
+	    out_head_relation,                       //
+	    out_fovs,                                //
+	    out_poses);                              //
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	// Fix fix.
 	for (uint32_t i = 0; i < view_count && i < ARRAY_SIZE(ns->config.head_pose_to_eye); i++) {
 		out_poses[i] = ns->config.head_pose_to_eye[i];
 	}
+
+	return XRT_SUCCESS;
 }
 
 bool
diff --git a/src/xrt/drivers/realsense/rs_ddev.c b/src/xrt/drivers/realsense/rs_ddev.c
index 89c721c97..8e2ee2e09 100644
--- a/src/xrt/drivers/realsense/rs_ddev.c
+++ b/src/xrt/drivers/realsense/rs_ddev.c
@@ -405,18 +405,6 @@ rs_ddev_get_tracked_pose(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
-rs_ddev_get_view_poses(struct xrt_device *xdev,
-                       const struct xrt_vec3 *default_eye_relation,
-                       int64_t at_timestamp_ns,
-                       uint32_t view_count,
-                       struct xrt_space_relation *out_head_relation,
-                       struct xrt_fov *out_fovs,
-                       struct xrt_pose *out_poses)
-{
-	assert(false);
-}
-
 static void
 rs_ddev_destroy(struct xrt_device *xdev)
 {
@@ -462,7 +450,7 @@ rs_ddev_create(int device_idx)
 	        rs->enable_relocalization, rs->enable_pose_prediction, rs->enable_pose_filtering);
 	rs->base.update_inputs = u_device_noop_update_inputs;
 	rs->base.get_tracked_pose = rs_ddev_get_tracked_pose;
-	rs->base.get_view_poses = rs_ddev_get_view_poses;
+	rs->base.get_view_poses = u_device_ni_get_view_poses;
 	rs->base.destroy = rs_ddev_destroy;
 	rs->base.name = XRT_DEVICE_REALSENSE;
 	rs->base.tracking_origin->type = XRT_TRACKING_TYPE_EXTERNAL_SLAM;
diff --git a/src/xrt/drivers/remote/r_device.c b/src/xrt/drivers/remote/r_device.c
index e77d4dbd6..d795e0176 100644
--- a/src/xrt/drivers/remote/r_device.c
+++ b/src/xrt/drivers/remote/r_device.c
@@ -179,18 +179,6 @@ r_device_get_hand_tracking(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
-r_device_get_view_poses(struct xrt_device *xdev,
-                        const struct xrt_vec3 *default_eye_relation,
-                        int64_t at_timestamp_ns,
-                        uint32_t view_count,
-                        struct xrt_space_relation *out_head_relation,
-                        struct xrt_fov *out_fovs,
-                        struct xrt_pose *out_poses)
-{
-	assert(false);
-}
-
 static void
 r_device_set_output(struct xrt_device *xdev, enum xrt_output_name name, const struct xrt_output_value *value)
 {
@@ -215,7 +203,7 @@ r_device_create(struct r_hub *r, bool is_left)
 	rd->base.update_inputs = r_device_update_inputs;
 	rd->base.get_tracked_pose = r_device_get_tracked_pose;
 	rd->base.get_hand_tracking = r_device_get_hand_tracking;
-	rd->base.get_view_poses = r_device_get_view_poses;
+	rd->base.get_view_poses = u_device_ni_get_view_poses;
 	rd->base.set_output = r_device_set_output;
 	rd->base.destroy = r_device_destroy;
 	rd->base.tracking_origin = &r->origin;
diff --git a/src/xrt/drivers/remote/r_hmd.c b/src/xrt/drivers/remote/r_hmd.c
index 32a8e7fa4..374fea43f 100644
--- a/src/xrt/drivers/remote/r_hmd.c
+++ b/src/xrt/drivers/remote/r_hmd.c
@@ -74,7 +74,7 @@ r_hmd_get_tracked_pose(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 r_hmd_get_view_poses(struct xrt_device *xdev,
                      const struct xrt_vec3 *default_eye_relation,
                      int64_t at_timestamp_ns,
@@ -86,23 +86,17 @@ r_hmd_get_view_poses(struct xrt_device *xdev,
 	struct r_hmd *rh = r_hmd(xdev);
 
 	if (!rh->r->latest.head.per_view_data_valid) {
-		u_device_get_view_poses(  //
-		    xdev,                 //
-		    default_eye_relation, //
-		    at_timestamp_ns,      //
-		    view_count,           //
-		    out_head_relation,    //
-		    out_fovs,             //
-		    out_poses);           //
-
-		// Done now
-		return;
+		return u_device_get_view_poses( //
+		    xdev,                       //
+		    default_eye_relation,       //
+		    at_timestamp_ns,            //
+		    view_count,                 //
+		    out_head_relation,          //
+		    out_fovs,                   //
+		    out_poses);                 //
 	}
 
-	if (view_count > ARRAY_SIZE(rh->r->latest.head.views)) {
-		U_LOG_E("Asking for too many views!");
-		return;
-	}
+	assert(view_count <= ARRAY_SIZE(rh->r->latest.head.views));
 
 	copy_head_center_to_relation(rh, out_head_relation);
 
@@ -110,6 +104,8 @@ r_hmd_get_view_poses(struct xrt_device *xdev,
 		out_poses[i] = rh->r->latest.head.views[i].pose;
 		out_fovs[i] = rh->r->latest.head.views[i].fov;
 	}
+
+	return XRT_SUCCESS;
 }
 
 static void
diff --git a/src/xrt/drivers/sample/sample_hmd.c b/src/xrt/drivers/sample/sample_hmd.c
index a1f1a6c5f..ddf91e9c5 100644
--- a/src/xrt/drivers/sample/sample_hmd.c
+++ b/src/xrt/drivers/sample/sample_hmd.c
@@ -128,7 +128,7 @@ sample_hmd_get_tracked_pose(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 sample_hmd_get_view_poses(struct xrt_device *xdev,
                           const struct xrt_vec3 *default_eye_relation,
                           int64_t at_timestamp_ns,
@@ -141,14 +141,14 @@ sample_hmd_get_view_poses(struct xrt_device *xdev,
 	 * For HMDs you can call this function or directly set
 	 * the `get_view_poses` function on the device to it.
 	 */
-	u_device_get_view_poses(  //
-	    xdev,                 //
-	    default_eye_relation, //
-	    at_timestamp_ns,      //
-	    view_count,           //
-	    out_head_relation,    //
-	    out_fovs,             //
-	    out_poses);           //
+	return u_device_get_view_poses( //
+	    xdev,                       //
+	    default_eye_relation,       //
+	    at_timestamp_ns,            //
+	    view_count,                 //
+	    out_head_relation,          //
+	    out_fovs,                   //
+	    out_poses);                 //
 }
 
 static xrt_result_t
diff --git a/src/xrt/drivers/simula/svr_hmd.c b/src/xrt/drivers/simula/svr_hmd.c
index 1af57ae4b..434aa9977 100644
--- a/src/xrt/drivers/simula/svr_hmd.c
+++ b/src/xrt/drivers/simula/svr_hmd.c
@@ -99,7 +99,7 @@ svr_hmd_get_tracked_pose(struct xrt_device *xdev,
 
 #define DEG_TO_RAD(DEG) (DEG * M_PI / 180.)
 
-static void
+static xrt_result_t
 svr_hmd_get_view_poses(struct xrt_device *xdev,
                        const struct xrt_vec3 *default_eye_relation,
                        int64_t at_timestamp_ns,
@@ -111,14 +111,17 @@ svr_hmd_get_view_poses(struct xrt_device *xdev,
 	//!@todo: default_eye_relation inherits from the env var OXR_DEBUG_IPD_MM / oxr_session.c
 	// probably needs a lot more attention
 
-	u_device_get_view_poses(  //
-	    xdev,                 //
-	    default_eye_relation, //
-	    at_timestamp_ns,      //
-	    view_count,           //
-	    out_head_relation,    //
-	    out_fovs,             //
-	    out_poses);           //
+	xrt_result_t xret = u_device_get_view_poses( //
+	    xdev,                                    //
+	    default_eye_relation,                    //
+	    at_timestamp_ns,                         //
+	    view_count,                              //
+	    out_head_relation,                       //
+	    out_fovs,                                //
+	    out_poses);                              //
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	//!@todo you may need to invert this - I can't test locally
 	float turn_vals[2] = {5.0, -5.0};
@@ -126,6 +129,8 @@ svr_hmd_get_view_poses(struct xrt_device *xdev,
 		struct xrt_vec3 y_up = (struct xrt_vec3)XRT_VEC3_UNIT_Y;
 		math_quat_from_angle_vector(DEG_TO_RAD(turn_vals[i]), &y_up, &out_poses[i].orientation);
 	}
+
+	return XRT_SUCCESS;
 }
 
 //!@todo: remove hard-coding and move to u_distortion_mesh
diff --git a/src/xrt/drivers/simulated/simulated_controller.c b/src/xrt/drivers/simulated/simulated_controller.c
index bf9d15b08..8a8a76f07 100644
--- a/src/xrt/drivers/simulated/simulated_controller.c
+++ b/src/xrt/drivers/simulated/simulated_controller.c
@@ -166,18 +166,6 @@ simulated_device_get_tracked_pose(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
-simulated_device_get_view_poses(struct xrt_device *xdev,
-                                const struct xrt_vec3 *default_eye_relation,
-                                int64_t at_timestamp_ns,
-                                uint32_t view_count,
-                                struct xrt_space_relation *out_head_relation,
-                                struct xrt_fov *out_fovs,
-                                struct xrt_pose *out_poses)
-{
-	assert(false);
-}
-
 static void
 simulated_device_set_output(struct xrt_device *xdev, enum xrt_output_name name, const struct xrt_output_value *value)
 {
@@ -369,7 +357,7 @@ simulated_create_controller(enum xrt_device_name name,
 	sd->base.update_inputs = simulated_device_update_inputs;
 	sd->base.get_tracked_pose = simulated_device_get_tracked_pose;
 	sd->base.get_hand_tracking = u_device_ni_get_hand_tracking;
-	sd->base.get_view_poses = simulated_device_get_view_poses;
+	sd->base.get_view_poses = u_device_ni_get_view_poses;
 	sd->base.set_output = simulated_device_set_output;
 	sd->base.destroy = simulated_device_destroy;
 	sd->base.tracking_origin = origin;
diff --git a/src/xrt/drivers/steamvr_lh/device.cpp b/src/xrt/drivers/steamvr_lh/device.cpp
index dc2dbb07b..959c42f96 100644
--- a/src/xrt/drivers/steamvr_lh/device.cpp
+++ b/src/xrt/drivers/steamvr_lh/device.cpp
@@ -174,8 +174,8 @@ HmdDevice::HmdDevice(const DeviceBuilder &builder) : Device(builder)
 	this->inputs = inputs_vec.data();
 	this->input_count = inputs_vec.size();
 
+	this->xrt_device::get_view_poses = &device_bouncer<HmdDevice, &HmdDevice::get_view_poses, xrt_result_t>;
 #define SETUP_MEMBER_FUNC(name) this->xrt_device::name = &device_bouncer<HmdDevice, &HmdDevice::name>
-	SETUP_MEMBER_FUNC(get_view_poses);
 	SETUP_MEMBER_FUNC(compute_distortion);
 #undef SETUP_MEMBER_FUNC
 }
@@ -515,7 +515,7 @@ HmdDevice::SetDisplayEyeToHead(uint32_t unWhichDevice,
 	this->eye[1].position = rightEye_postquat.position;
 }
 
-void
+xrt_result_t
 HmdDevice::get_view_poses(const xrt_vec3 *default_eye_relation,
                           uint64_t at_timestamp_ns,
                           uint32_t view_count,
@@ -526,14 +526,17 @@ HmdDevice::get_view_poses(const xrt_vec3 *default_eye_relation,
 	struct xrt_vec3 eye_relation = *default_eye_relation;
 	eye_relation.x = ipd;
 
-	u_device_get_view_poses( //
-	    this,                //
-	    &eye_relation,       //
-	    at_timestamp_ns,     //
-	    view_count,          //
-	    out_head_relation,   //
-	    out_fovs,            //
-	    out_poses);          //
+	xrt_result_t xret = u_device_get_view_poses( //
+	    this,                                    //
+	    &eye_relation,                           //
+	    at_timestamp_ns,                         //
+	    view_count,                              //
+	    out_head_relation,                       //
+	    out_fovs,                                //
+	    out_poses);                              //
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	out_poses[0].orientation = this->eye[0].orientation;
 	out_poses[0].position.z = this->eye[0].position.z;
@@ -541,6 +544,8 @@ HmdDevice::get_view_poses(const xrt_vec3 *default_eye_relation,
 	out_poses[1].orientation = this->eye[1].orientation;
 	out_poses[1].position.z = this->eye[1].position.z;
 	out_poses[1].position.y = this->eye[1].position.y;
+
+	return XRT_SUCCESS;
 }
 
 bool
diff --git a/src/xrt/drivers/steamvr_lh/device.hpp b/src/xrt/drivers/steamvr_lh/device.hpp
index cad0631de..1aac23d9b 100644
--- a/src/xrt/drivers/steamvr_lh/device.hpp
+++ b/src/xrt/drivers/steamvr_lh/device.hpp
@@ -124,7 +124,7 @@ public:
 	                    const vr::HmdMatrix34_t &eyeToHeadLeft,
 	                    const vr::HmdMatrix34_t &eyeToHeadRight);
 
-	void
+	xrt_result_t
 	get_view_poses(const xrt_vec3 *default_eye_relation,
 	               uint64_t at_timestamp_ns,
 	               uint32_t view_count,
diff --git a/src/xrt/drivers/survive/survive_driver.c b/src/xrt/drivers/survive/survive_driver.c
index c7d100310..37b315306 100644
--- a/src/xrt/drivers/survive/survive_driver.c
+++ b/src/xrt/drivers/survive/survive_driver.c
@@ -523,7 +523,7 @@ survive_controller_get_hand_tracking(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
+static xrt_result_t
 survive_device_get_view_poses(struct xrt_device *xdev,
                               const struct xrt_vec3 *default_eye_relation,
                               int64_t at_timestamp_ns,
@@ -547,19 +547,24 @@ survive_device_get_view_poses(struct xrt_device *xdev,
 		eye_relation.x = survive->hmd.ipd;
 	}
 
-	u_device_get_view_poses( //
-	    xdev,                //
-	    &eye_relation,       //
-	    at_timestamp_ns,     //
-	    view_count,          //
-	    out_head_relation,   //
-	    out_fovs,            //
-	    out_poses);          //
+	xrt_result_t xret = u_device_get_view_poses( //
+	    xdev,                                    //
+	    &eye_relation,                           //
+	    at_timestamp_ns,                         //
+	    view_count,                              //
+	    out_head_relation,                       //
+	    out_fovs,                                //
+	    out_poses);                              //
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	// This is for the Index' canted displays, on the Vive [Pro] they are identity.
 	for (uint32_t i = 0; i < view_count && i < ARRAY_SIZE(survive->hmd.config.display.rot); i++) {
 		out_poses[i].orientation = survive->hmd.config.display.rot[i];
 	}
+
+	return XRT_SUCCESS;
 }
 
 enum InputComponent
diff --git a/src/xrt/drivers/twrap/twrap_slam.c b/src/xrt/drivers/twrap/twrap_slam.c
index 7c8801fa8..94458e399 100644
--- a/src/xrt/drivers/twrap/twrap_slam.c
+++ b/src/xrt/drivers/twrap/twrap_slam.c
@@ -135,18 +135,6 @@ twrap_slam_get_tracked_pose(struct xrt_device *xdev,
 	return XRT_SUCCESS;
 }
 
-static void
-twrap_slam_get_view_poses(struct xrt_device *xdev,
-                          const struct xrt_vec3 *default_eye_relation,
-                          int64_t at_timestamp_ns,
-                          uint32_t view_count,
-                          struct xrt_space_relation *out_head_relation,
-                          struct xrt_fov *out_fovs,
-                          struct xrt_pose *out_poses)
-{
-	assert(false);
-}
-
 static void
 twrap_slam_destroy(struct xrt_device *xdev)
 {
@@ -173,7 +161,7 @@ twrap_slam_create_device(struct xrt_frame_context *xfctx,
 
 	dx->base.update_inputs = u_device_noop_update_inputs;
 	dx->base.get_tracked_pose = twrap_slam_get_tracked_pose;
-	dx->base.get_view_poses = twrap_slam_get_view_poses;
+	dx->base.get_view_poses = u_device_ni_get_view_poses;
 	dx->base.destroy = twrap_slam_destroy;
 	dx->base.name = name;
 	dx->base.tracking_origin->type = XRT_TRACKING_TYPE_OTHER;
diff --git a/src/xrt/drivers/vive/vive_device.c b/src/xrt/drivers/vive/vive_device.c
index cb31c0540..03c350500 100644
--- a/src/xrt/drivers/vive/vive_device.c
+++ b/src/xrt/drivers/vive/vive_device.c
@@ -208,7 +208,7 @@ vive_device_get_tracked_pose(struct xrt_device *xdev,
 	return xret;
 }
 
-static void
+static xrt_result_t
 vive_device_get_view_poses(struct xrt_device *xdev,
                            const struct xrt_vec3 *default_eye_relation,
                            int64_t at_timestamp_ns,
@@ -222,20 +222,25 @@ vive_device_get_view_poses(struct xrt_device *xdev,
 	// Only supports two views.
 	assert(view_count <= 2);
 
-	u_device_get_view_poses(  //
-	    xdev,                 //
-	    default_eye_relation, //
-	    at_timestamp_ns,      //
-	    view_count,           //
-	    out_head_relation,    //
-	    out_fovs,             //
-	    out_poses);           //
+	xrt_result_t xret = u_device_get_view_poses( //
+	    xdev,                                    //
+	    default_eye_relation,                    //
+	    at_timestamp_ns,                         //
+	    view_count,                              //
+	    out_head_relation,                       //
+	    out_fovs,                                //
+	    out_poses);                              //
+	if (xret != XRT_SUCCESS) {
+		return xret;
+	}
 
 	// This is for the Index' canted displays, on the Vive [Pro] they are identity.
 	struct vive_device *d = vive_device(xdev);
 	for (uint32_t i = 0; i < view_count && i < ARRAY_SIZE(d->config.display.rot); i++) {
 		out_poses[i].orientation = d->config.display.rot[i];
 	}
+
+	return XRT_SUCCESS;
 }
 
 static int
diff --git a/src/xrt/include/xrt/xrt_device.h b/src/xrt/include/xrt/xrt_device.h
index b01f58fe1..d1051d8a9 100644
--- a/src/xrt/include/xrt/xrt_device.h
+++ b/src/xrt/include/xrt/xrt_device.h
@@ -535,13 +535,13 @@ struct xrt_device
 	 *                         (Caution: Even if you have eye tracking, you
 	 *                         won't use eye orientation here!)
 	 */
-	void (*get_view_poses)(struct xrt_device *xdev,
-	                       const struct xrt_vec3 *default_eye_relation,
-	                       int64_t at_timestamp_ns,
-	                       uint32_t view_count,
-	                       struct xrt_space_relation *out_head_relation,
-	                       struct xrt_fov *out_fovs,
-	                       struct xrt_pose *out_poses);
+	xrt_result_t (*get_view_poses)(struct xrt_device *xdev,
+	                               const struct xrt_vec3 *default_eye_relation,
+	                               int64_t at_timestamp_ns,
+	                               uint32_t view_count,
+	                               struct xrt_space_relation *out_head_relation,
+	                               struct xrt_fov *out_fovs,
+	                               struct xrt_pose *out_poses);
 
 	/**
 	 * Compute the distortion at a single point.
@@ -823,9 +823,8 @@ xrt_device_get_view_poses(struct xrt_device *xdev,
                           struct xrt_fov *out_fovs,
                           struct xrt_pose *out_poses)
 {
-	xdev->get_view_poses(xdev, default_eye_relation, at_timestamp_ns, view_count, out_head_relation, out_fovs,
-	                     out_poses);
-	return XRT_SUCCESS;
+	return xdev->get_view_poses(xdev, default_eye_relation, at_timestamp_ns, view_count, out_head_relation,
+	                            out_fovs, out_poses);
 }
 
 /*!
diff --git a/src/xrt/ipc/client/ipc_client_hmd.c b/src/xrt/ipc/client/ipc_client_hmd.c
index cf90b420b..1b5f6edb9 100644
--- a/src/xrt/ipc/client/ipc_client_hmd.c
+++ b/src/xrt/ipc/client/ipc_client_hmd.c
@@ -62,7 +62,7 @@ ipc_client_hmd(struct xrt_device *xdev)
 	return (ipc_client_hmd_t *)xdev;
 }
 
-static void
+static xrt_result_t
 call_get_view_poses_raw(ipc_client_hmd_t *ich,
                         const struct xrt_vec3 *default_eye_relation,
                         int64_t at_timestamp_ns,
@@ -117,6 +117,7 @@ call_get_view_poses_raw(ipc_client_hmd_t *ich,
 
 out:
 	ipc_client_connection_unlock(ipc_c);
+	return xret;
 }
 
 
@@ -126,7 +127,7 @@ out:
  *
  */
 
-static void
+static xrt_result_t
 ipc_client_hmd_get_view_poses(struct xrt_device *xdev,
                               const struct xrt_vec3 *default_eye_relation,
                               int64_t at_timestamp_ns,
@@ -149,7 +150,7 @@ ipc_client_hmd_get_view_poses(struct xrt_device *xdev,
 		    at_timestamp_ns,                     //
 		    view_count,                          //
 		    &info);                              //
-		IPC_CHK_ONLY_PRINT(ich->ipc_c, xret, "ipc_call_device_get_view_poses_2");
+		IPC_CHK_AND_RET(ich->ipc_c, xret, "ipc_call_device_get_view_poses_2");
 
 		*out_head_relation = info.head_relation;
 		for (int i = 0; i < 2; i++) {
@@ -159,20 +160,21 @@ ipc_client_hmd_get_view_poses(struct xrt_device *xdev,
 
 	} else if (view_count <= IPC_MAX_RAW_VIEWS) {
 		// Artificial limit.
-
-		call_get_view_poses_raw(  //
-		    ich,                  //
-		    default_eye_relation, //
-		    at_timestamp_ns,      //
-		    view_count,           //
-		    out_head_relation,    //
-		    out_fovs,             //
-		    out_poses);           //
+		xret = call_get_view_poses_raw( //
+		    ich,                        //
+		    default_eye_relation,       //
+		    at_timestamp_ns,            //
+		    view_count,                 //
+		    out_head_relation,          //
+		    out_fovs,                   //
+		    out_poses);                 //
 	} else {
 		IPC_ERROR(ich->ipc_c, "Cannot handle %u view_count, %u or less supported.", view_count,
 		          (uint32_t)IPC_MAX_RAW_VIEWS);
 		assert(false && !"Too large view_count!");
 	}
+
+	return xret;
 }
 
 static bool