Thanks for the bug report. These log messages look relevant:
[118317.782940] jarek-Inspiron gnome-shell[3471]: Window manager warning:
Configuring CRTC 79 with mode 1881 (1920 x 1200 @ 59,950172) at position 0, 0
and transform 0 failed
[118319.278873] jarek-Inspiron gnome-shell[3471]:
meta_display_get_monitor_in_fullscreen: assertion 'monitor >= 0 && monitor <
n_logical_monitors' failed
and
[94391.010815] jarek-Inspiron gnome-shell[3471]: Window manager warning:
Configuring CRTC 79 with mode 1881 (1920 x 1200 @ 59,950172) at position 0, 0
and transform 0 failed
[94391.490646] jarek-Inspiron gnome-shell[3471]:
meta_display_get_monitor_in_fullscreen: assertion 'monitor >= 0 && monitor <
n_logical_monitors' failed
Can you please reproduce the problem again and then run 'journalctl -b0'
to see if the same error messages occur during the flicker?
** Tags added: multimonitor
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
** Package changed: gnome-shell (Ubuntu) => mutter (Ubuntu)
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https://bugs.launchpad.net/bugs/2023647
Title:
Screens go into flicker cycle after going blank with external
monitor(s)
Status in mutter package in Ubuntu:
Incomplete
Bug description:
This happens whenever screen goes blank after inactivity with external
monitors.
When there is only one external monitor after few cycles the system
recovers from the bug.
When there are more than one monitors the system almost never recovers
until unplugging extra monitor, as shown in video:
https://photos.app.goo.gl/td6coEKFQd3DKe9C7
Happens on desktop and login screen. The same result with Wayland and
X11. Does not depend on size of the monitor, cable (HDMI or USB-C) or
is it connected via USB-C hub or directly.
ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: gnome-shell 44.1-0ubuntu1
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 13 12:36:44 2023
DisplayManager: gdm3
InstallationDate: Installed on 2023-04-13 (60 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64
(20220809.1)
RelatedPackageVersions: mutter-common 44.1-0ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: Upgraded to lunar on 2023-04-21 (52 days ago)
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