Hello Marco, or anyone else affected,

Accepted mutter into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/mutter/3.36.4-0ubuntu0.20.04.2 in a
few hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1889090

Title:
  GNOME Shell doesn't start Ubuntu session with 3.36.4 as per assertion
  in meta_monitor_manager_xrandr_update_screen_size

Status in mutter package in Ubuntu:
  Fix Released
Status in mutter source package in Focal:
  Fix Committed

Bug description:
  Reported initially as comments of bug #1887998:

  [ Impact ]

  Ubuntu session doesn't start with some particular monitor
  configurations, as per this fatal assertion:

  Jul 27 00:30:33 jojda gnome-shell[15068]: 
mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size:
 assertion failed: (width > 0 && height > 0 && scale > 0)
  Jul 27 00:30:33 jojda gnome-shell[15068]: Bail out! 
mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size:
 assertion failed: (width > 0 && height > 0 && scale > 0)
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Main process 
exited, code=dumped, status=6/ABRT
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Failed with 
result 'core-dump'.

  [ Test case ]

  Start ubuntu session, you should be able to log-in and no error
  fallback dialog is shown.

  [ Regression potential ]

  Screen size is not set properly for the session, panning is enabled.

  ---

  https://launchpad.net/ubuntu/+source/mutter/3.36.4-0ubuntu0.20.04.1
  does not fix it. Unfortunately I cannot switch to Wayland because it
  doesn't start on my system (video card: 00:02.0 VGA compatible
  controller: Intel Corporation Iris Plus Graphics 655 (rev 01)).

  Symptom is that after waking up from sleep I get white screen of death
  that says what the bug description says ("Oh no! Something has gone
  wrong. A problem has occurred and the system can't recover. Please log
  out and try again.") and I have to click the Log out button at which
  points it lets me log in again. Sometime it does the same thing again
  right after logging in.

  Syslog message are also pretty much the same as from other comments,
  here you can see it failing twice, first up while running then right
  after re-login.

  Jul 27 00:30:31 jojda gnome-shell[4633]: gvc_mixer_card_get_index: assertion 
'GVC_IS_MIXER_CARD (card)' failed
  Jul 27 00:30:32 jojda gnome-shell[4633]: **
  Jul 27 00:30:32 jojda gnome-shell[4633]: 
mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size:
 assertion failed: (width > 0 && height > 0 && scale > 0)
  Jul 27 00:30:32 jojda gnome-shell[4633]: Bail out! 
mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size:
 assertion failed: (width > 0 && height > 0 && scale > 0)
  Jul 27 00:30:32 jojda systemd[4297]: gnome-shell-x11.service: Main process 
exited, code=dumped, status=6/ABRT
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Failed with 
result 'core-dump'.
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Scheduled 
restart job, restart counter is at 1.
  Jul 27 00:30:33 jojda systemd[4297]: Stopped target GNOME X11 Session 
(session: ubuntu).
  Jul 27 00:30:33 jojda systemd[4297]: Stopping GNOME X11 Session (session: 
ubuntu).
  Jul 27 00:30:33 jojda systemd[4297]: Stopped target GNOME X11 Session.
  Jul 27 00:30:33 jojda systemd[4297]: Stopping GNOME X11 Session.
  Jul 27 00:30:33 jojda systemd[4297]: Stopped target GNOME Shell on X11.
  Jul 27 00:30:33 jojda systemd[4297]: Stopping GNOME Shell on X11.
  Jul 27 00:30:33 jojda systemd[4297]: Stopped GNOME Shell on X11.
  Jul 27 00:30:33 jojda systemd[4297]: Starting GNOME Shell on X11...
  Jul 27 00:30:33 jojda gnome-shell[15068]: Enabling experimental feature 
'x11-randr-fractional-scaling'
  Jul 27 00:30:33 jojda gnome-shell[15068]: **
  Jul 27 00:30:33 jojda gnome-shell[15068]: 
mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size:
 assertion failed: (width > 0 && height > 0 && scale > 0)
  Jul 27 00:30:33 jojda gnome-shell[15068]: Bail out! 
mutter:ERROR:../src/backends/x11/meta-monitor-manager-xrandr.c:211:meta_monitor_manager_xrandr_update_screen_size:
 assertion failed: (width > 0 && height > 0 && scale > 0)
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Main process 
exited, code=dumped, status=6/ABRT
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Failed with 
result 'core-dump'.
  Jul 27 00:30:33 jojda systemd[4297]: Failed to start GNOME Shell on X11.
  Jul 27 00:30:33 jojda systemd[4297]: Dependency failed for GNOME Shell on X11.
  Jul 27 00:30:33 jojda systemd[4297]: Dependency failed for GNOME X11 Session.
  Jul 27 00:30:33 jojda systemd[4297]: Dependency failed for GNOME X11 Session 
(session: ubuntu).
  Jul 27 00:30:33 jojda systemd[4297]: [email protected]: Job 
[email protected]/start failed with result 'dependency'.
  Jul 27 00:30:33 jojda systemd[4297]: gnome-session-x11.target: Job 
gnome-session-x11.target/start failed with result 'dependency'.
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.target: Job 
gnome-shell-x11.target/start failed with result 'dependency'.
  Jul 27 00:30:33 jojda systemd[4297]: gnome-shell-x11.service: Scheduled 
restart job, restart counter is at 2.
  Jul 27 00:30:33 jojda systemd[4297]: Stopped GNOME Shell on X11.

  ---

  Handled in e.u.c:
   https://errors.ubuntu.com/problem/2acb34a4bbf65f5d7ab2d0ccd4dc1adda82724d5

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