I'm using a laptop with Win 11 23H2, Reverb G2 with the Oasis SteamVR driver.

To use VR I need to:
-Reboot PC if opened SteamVR previously.
-Connect headset
-Open SteamVR ** black screen in VR **
-Close SteamVR ** takes >10secs, mouse cursor lockup for 5-10 sec **
-Open SteamVR. Works until SteamVR is closed.
-Close SteamVR.

If I open SteamVR again at this point without rebooting the PC, it takes 10-20 seconds, multiple mouse cursor lockups for 5-10 seconds. Lose mouse cursor in the secondary monitor. (Disconnecting the secondary monitor locks up the entire system, so does ctrl+shift+winkey+b driver reset) and may see a video related BSOD.)

Here, each time SteamVR successfully opens, there's a black screen in the VR headset, but tracking works and the frame rate is 10FPS like it's running on the iGPU.

All SteamVR related apps (with a unique file icon) are set to use the discreet GPU in Windows Settings->System->Display->Graphics. Not sure if it makes a difference.

Don't know if this is the Oasis SteamVR driver, or SteamVR choosing the iGPU. The headset is always plugged into the mini-DP of the discreet GPU.

EDIT: After changing all the SteamVR apps to manually run on the discreet GPU, the above only happens after using Unity without a restart. SteamVR can be opened/closed at any time and works fine.