Gnome shell crashes on dual monitor lock screen

[djpate]

I have a dual screen setup on my laptop. One is HIDPI and the other one is a classic external monitor over HDMI.

I've setup my screens the way I like it and they work fine as long as the computer doesn't look himself due to inactivity.

As soon as this happens, gnome crashes and I have to log back in - sometimes 3-4 times before getting back to my desktop but with all prograns and windows closed.

Oct 10 09:24:44 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:44 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:45 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:46 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:47 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:48 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:49 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:50 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:51 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:51 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:51 christophev-laptop pkexec[4219]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Oct 10 09:24:51 christophev-laptop pkexec[4219]: pate: Executing command [USER=root] [TTY=unknown] [CWD=/home/pate] [COMMAND=/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 1193]
Oct 10 09:24:52 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:52 christophev-laptop pkexec[4225]: gdm: Error executing command as another user: Not authorized [USER=root] [TTY=unknown] [CWD=/var/lib/gdm3] [COMMAND=/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 1110]
Oct 10 09:24:52 christophev-laptop org.gnome.SettingsDaemon.Power.desktop[1123]: Error executing command as another user: Not authorized
Oct 10 09:24:52 christophev-laptop org.gnome.SettingsDaemon.Power.desktop[1123]: This incident has been reported.
Oct 10 09:24:52 christophev-laptop pkexec[4226]: pam_unix(polkit-1:session): session opened for user root by (uid=1000)
Oct 10 09:24:52 christophev-laptop pkexec[4226]: pate: Executing command [USER=root] [TTY=unknown] [CWD=/home/pate] [COMMAND=/usr/lib/gnome-settings-daemon/gsd-backlight-helper --set-brightness 1249]
Oct 10 09:24:53 christophev-laptop gnome-shell[3920]: clutter-actor.c:10050: Actor 'StWidget' tried to allocate a size of -1.00 x -1.00
Oct 10 09:24:54 christophev-laptop kernel: gnome-shell[3920]: segfault at 8 ip 00007fae2eb67877 sp 00007ffe5f1664d0 error 4 in libmutter-1.so.0.0.0[7fae2eabe000+141000]
Oct 10 09:24:54 christophev-laptop org.gnome.Shell.desktop[3920]: (EE)
Oct 10 09:24:54 christophev-laptop org.gnome.Shell.desktop[3920]: Fatal server error:
Oct 10 09:24:54 christophev-laptop org.gnome.Shell.desktop[3920]: (EE) failed to read Wayland events: Broken pipe
Oct 10 09:24:54 christophev-laptop org.gnome.Shell.desktop[3920]: (EE)
Oct 10 09:24:54 christophev-laptop polkitd(authority=local)[807]: Unregistered Authentication Agent for unix-session:32 (system bus name :1.1152, object path /org/freedesktop/PolicyKit1/AuthenticationAgent, locale en_US.UTF-8) (disconnected from bus)

[Daniel van Vugt (vanvugt)]

It appears that mutter is responsible for crashing your gnome-shell:

Oct 10 09:24:54 christophev-laptop kernel: gnome-shell[3920]: segfault at 8 ip 00007fae2eb67877 sp 00007ffe5f1664d0 error 4 in libmutter-1.so.0.0.0[7fae2eabe000+141000]

However in order to diagnose the problem further we will need a stack trace. Please look in /var/crash for relevant crash files. And then submit them using this command:

ubuntu-bug /var/crash/_my_crash_report.crash

[Launchpad Janitor (janitor)]

[Expired for gnome-shell (Ubuntu) because there has been no activity for 60 days.]