This bug was fixed in the package gnome-control-center -
1:41.7-0ubuntu0.22.04.7
---------------
gnome-control-center (1:41.7-0ubuntu0.22.04.7) jammy; urgency=medium
* Cherry-pick 3 patches to fix mirror mode crash
when resolution of the 2 monitors don't match (LP: #2026228)
-- Dirk Su <[email protected]> Fri, 07 Jul 2023 12:45:49 +0800
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https://bugs.launchpad.net/bugs/2026228
Title:
gnome-control-center crashed when switching to mirror mode and
monitors don't have matched resolution
Status in OEM Priority Project:
Confirmed
Status in gnome-control-center package in Ubuntu:
Fix Released
Status in gnome-control-center source package in Jammy:
Fix Released
Status in gnome-control-center source package in Kinetic:
Won't Fix
Status in gnome-control-center source package in Lunar:
Fix Released
Bug description:
[Impact]
gnome-control-center crashed when switching to mirror mode and monitors don't
have matched resolution
[Test case]
Mirror mode is only an option if there are only 2 monitors connected even if
one monitor is disabled. A laptop's internal screen counts as one of the
monitors.
This particular bug requires two screens that have a screen resolution
that they don't both share. (See comment 12 for an example).
1. Connect the monitors
2. Open the GNOME Settings app (gnome-control-center)
3. On the left sidebar, click Displays to switch to the Display panel
4. Switch to mirror mode
3. gnome-control-center won't crash
[Where problems could occur]
This only modifies the code related to mirror mode in Displays panel.
For Lunar, check variable (best_mode) before using it. This patch is
backported from GNOME 45 Alpha.
For Jammy, include the Lunar patch and update the way to find cloning
mode. These 2 additional patches are backported from gnome-control-
center 43.
[Other info]
Two Merge Request are related
1. Check best_mode exist before adding flag
(https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/1835)
2. Use virtual clone modes when mirroring
(https://gitlab.gnome.org/GNOME/gnome-control-center/-/merge_requests/1376)
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