Screen tearing in SteamVR when adaptive sync is enabled on any of the connected monitors.

NVIDIA Open GPU Kernel Modules Version

590.48.01

Please confirm this issue does not happen with the proprietary driver (of the same version). This issue tracker is only for bugs specific to the open kernel driver.

• I confirm that this does not happen with the proprietary driver package.

Operating System and Version

Arch Linux

Kernel Release

6.18.2-2-cachyos

Please confirm you are running a stable release kernel (e.g. not a -rc). We do not accept bug reports for unreleased kernels.

• I am running on a stable kernel release.

Hardware: GPU

GeForce RTX 3090 Ti

Describe the bug

If adaptive sync is enabled on any of my connected monitors and I start SteamVR, the VR headset's displays will experience some kind of screen tearing, making it unusable for VR gaming.

I'm using a Valve Index VR headset.

In the performance graph it will look like this:

Currently the only working configuration is using the proprietary driver and turning off GSP - so it seems to have something to do with GSP.
What it should look like:

A working workaround is setting the following in a modprobe.d file:
options nvidia-modeset conceal_vrr_caps=1

To Reproduce

1. Enable adaptive sync in your monitor's settings and optionally turn it on in your desktop environment's settings (the issue also manifests if you have adaptive sync "off" in your desktop environment's settings)
2. Start SteamVR
3. Put on your VR headset and observe screen tearing and stuttering in the headset's display

Bug Incidence

Always

nvidia-bug-report.log.gz

nvidia-bug-report.log.gz

More Info

There is also a forum thread here:
https://forums.developer.nvidia.com/t/enabling-gsp-makes-steamvr-unplayable-on-rtx-3090ti/298694
If the issue is wrong here, please inform the respective team on your side and close one of the two tickets.

Start with nvidia-bug-report.log.gz and the linked forum thread, then reproduce with adaptive sync enabled on a connected monitor before starting SteamVR. Compare behavior with the proprietary driver and with options nvidia-modeset conceal_vrr_caps=1; done means the Valve Index no longer shows tearing and stuttering under the open driver.