XR Core events won't fire after headset goes to sleep and wakes up again

[Gellert5225]

Isaac Sim Version

[x] 5.1.0

Operating System

[x] Ubuntu 24.04

Headset

[x] Meta Quest 3

GPU Information

• Model: RTX 3090
• Driver Version: 580

Topic Description

Detailed Description

I have successfully set up an event for my right hand controller's trigger button.

self._xrcore = xr_core.XRCore.get_singleton()
self._right_hand = self._xrcore.get_input_device("/user/hand/right")
self._event_generator = self._right_hand.bind_event_generator("trigger", "right_trigger", ["press", "release", "update", "state"])

message_bus: carb.events.IEventStream = self._xrcore.get_message_bus()
message_type_trigger: int = carb.events.type_from_string("right_trigger.state")
self._sub = message_bus.create_subscription_to_pop_by_type(message_type_trigger, self._on_xr_input_event)

The _on_xr_input_event function prints trigger value as expected, but once I put my headset down for 15 seconds, it goes to sleep mode, and when I put it back on, everything else works, I can teleport around, pick up objects etc, but the event won't fire.

Error Messages

I also get this weird error message when setting up the event generator:

2025-12-08T23:39:44Z [31,319ms] [Error] [omni.kit.xr.core.python] bind_event_generator right_trigger
2025-12-08T23:39:44Z [31,319ms] [Error] [omni.kit.xr.core.python] bind_event_generator token: press
2025-12-08T23:39:44Z [31,319ms] [Error] [omni.kit.xr.core.python] bind_event_generator token: release
2025-12-08T23:39:44Z [31,319ms] [Error] [omni.kit.xr.core.python] bind_event_generator token: update
2025-12-08T23:39:44Z [31,319ms] [Error] [omni.kit.xr.core.python] bind_event_generator token: state

[vick-yu]

Thanks for the detailed report and code examples, this is very helpful.​

From your description it sounds like the custom XRCore event generator and message-bus subscription work correctly until the Quest 3 goes to sleep and the XR session is effectively restarted, after which the built-in XR interactions still function but your "right_trigger" events no longer arrive. That suggests the bindings may be tied to the original XR session or input-device instance and are not being re-established when the headset wakes.​

A couple of questions and suggestions to help narrow this down:

• Are you seeing any additional XR-related warnings or errors in the Isaac Sim or Kit logs around the time the headset goes to sleep/wakes, beyond the bind_event_generator messages you shared?​

• If possible, could you try a minimal Kit/Omniverse sample app with a similar XRCore.get_singleton() + bind_event_generator + message-bus subscription pattern and see if the same sleep/wake behavior occurs there? This would help determine whether the issue is specific to Isaac Sim or affects the underlying Kit/XR stack more generally.​

In parallel, a potential workaround would be to listen for XR/session lifecycle changes and re-run your bind_event_generator and subscription setup when the session is recreated after wake, so the event generator is bound to the new device/session. If you are able to share a minimal script or extension that reproduces the issue, that would also make it easier for the XR/Kit team to investigate.

[Gellert5225]

1. No I do not see additional warnings/errors around the time when my headset goes to sleep/awake
2. The issue still presents with a minimal extension.

Which event listener would I use to listen to XR lifecycle? So far I've tried xr.enable/disable, xr_display.enable/disable, xr_profile.vr.enable/disable, xr_system.enable/disable, none of them was fired when the headset goes to sleep. They were only fired when I hit "Stop VR" in Issac-sim.