Wayland lag/stuttering since kernel 6.11.2

[fbl]

@Caleb_Metz

Hello. FW16 here. Arch linux and sway. I upgraded from 6.11.9 to 6.12.1 this morning as part of a full system upgrade. Didn’t even occur to me to check if the kernel had updated.

If this issue only occurs with 6.12.x, but not with 6.11.9, it might be related to Wrong frame timing/jerkiness with 120Hz display on 6.12 (bisected) (#3742) · Issues · drm / amd · GitLab

tl;dr: You can try to use kernel cmdline amdgpu.dcdebugmask=0x10 as a workaround until the issue is fixed.

[Steven_McClain]

I had the lag/stuttering issue after upgrading to 6.12.x, running Arch + Sway.

The fix for me was disabling adaptive_sync in my sway config (~/.config/sway/config):

output * adaptive_sync off

Sharing in case it helps anyone else.