same having this error as well. with “[ 12.960303] [drm:nv_drm_atomic_commit [nvidia_drm]] ERROR [nvidia-drm] [GPU ID 0x00000a00] Flip event timeout on head 0” (somtimes happening in flip 1 or 2 instead of 0) in driver 545, although I am unsure if it’s for the same reason. Can’t figure why it happens but it’s make the system almost unbootable.
Please , this is getting really annoying.