Focus Loss Issue with (New) Input System / TrackedDeviceRaycaster

Hi,

In Unity 2019.4 LTS, using InputSystem/Plugins/UI classes TrackedDeviceRaycaster and InputSystemUIInputModule classes: How can I convince the system to keep working (controller moves, button presses) even if the game window (editor or build, but specifically build) loses focus?

We use a TrackedDeviceRaycaster with default settings on each Canvas, and a central EventSystem and InputSystemUIInputModule. This works fine for movement tracking + clicks - as long as the game window has focus. If it loses focus, Raycast() in TrackedDeviceRaycaster is not even being called. It seems from stacktrace debugging that in InputSystemUIInputModule.ProcessPointer(), state.changedThisFrame is no longer true if there is no focus.

Can someone point out to me why this is happening and how to change this? While this is not an issue on standalone VR, we do have issues on PC with opening browser windows or other support tools which lead to the game not having focus anymore.

If the "way to go" is not using that new input system, what should we use?

Thanks,

Philip

 

FWIW: This issue no longer occurs in Unity 2019.4.40, as well as 2021 with the same setup and default settings, which includes the new input settings (in project settings): "Reset And Disable Non-Background Devices" in Background Behaviour.

https://docs.unity3d.com/Packages/com.unity.inputsystem@1.4/manual/Settings.html