breaks PRIME sync i.e. Optimus hardware with nvidia binary driver, PRIME output and Sync (nvidia-drm.modeset=1 kernel parameter) active.
Symptoms differ slightly depending on system.
e.g. running gdm/gnome after about 10 seconds the display gets frozen including mouse pointer and I can move around a second mouse pointer to move around but no screen updates occur any more. No error messages or warnings, the xserver is running fine, I can switch to text console and back or zap the xserver but no more screen updates.
Another user reported running lightdm it take 1 min to see a login but screen updates occur every 30sec.
Reverting this commit or deactivating PRIME Sync by setting nvidia-drm.modeset=0 returns the xserver to normal operation.
Reverted from 1.19 branch, will be in 1.19.5 shortly.
(In reply to Adam Jackson from comment #1)
> Reverted from 1.19 branch, will be in 1.19.5 shortly.
1.19.5 works fine.