Microstuttering and terrible frametime when using WSI

[Taskerer]

Is there an existing issue for this?

• [x] I have searched the existing issues

Are you using any gamescope patches or a forked version of gamescope?

• [x] The issue occurs on upstream gamescope without any modifications

Current Behavior

Microstuttering and horrible frametime when using WSI on Steam Deck LCD/OLED. We have tested and when disabling WSI ENABLE_GAMESCOPE_WSI=0, the frametime became smooth and the image became smooth without microstutters. On OLED, disabling WSI results in inaccessibility of HDR. Also on SteamOS 3.5 with gamescope-3.14.2-1 there are no problems with frametime and microstutters. Screenshots with and without WSI are attached below. So please pay attention to this problem!

Steps To Reproduce

Launching games using WSI on Steam Deck

Hardware information

- Distro: SteamOS 3.6.21, 3.7, 3.5
- CPU: AMD Custom APU 0405
- GPU: AMD Custom GPU 0405 (RADV VANGOGH)
- Driver Version: Mesa 24.3.0-devel (git-4f92f8fcbd)

Software information

- Desktop environment:
- Session type: 
- Gamescope version: 
- Gamescope launch command(s):

Which gamescope backends have the issue you are reporting?

• [ ] Wayland (default for nested gamescope)
• [x] DRM (default for embedded gamescope, i.e. gamescope-session)
• [ ] SDL
• [ ] OpenVR

Logging, screenshots, or anything else

No response