It looks like the Nvidia kernel driver just stopped accepting new frames
from the Wayland session:
Sep 06 18:52:38 Nexus kernel: [drm:nv_drm_atomic_commit [nvidia_drm]] *ERROR*
[nvidia-drm] [GPU ID 0x00000a00] Flip event timeout on head 0
Sep 06 18:52:41 Nexus kernel: [drm:nv_drm_atomic_commit [nvidia_drm]] *ERROR*
[nvidia-drm] [GPU ID 0x00000a00] Flip event timeout on head 1
(also mentioned in bug 2069694) Do you find the problem usually
coincides with those log messages?
Please try disabling the "atomic" feature by adding this to
/etc/environment:
MUTTER_DEBUG_FORCE_KMS_MODE=simple
and reboot.
** Tags added: nvidia
** Tags added: nvidia-wayland wayland wayland-session
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Package changed: mutter (Ubuntu) => nvidia-graphics-drivers-550
(Ubuntu)
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https://bugs.launchpad.net/bugs/2079867
Title:
[nvidia] Screen freeze on Wayland using Nvidia 550
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