I can reproduced the gnome-control-center crash on Lunar. The crash only
happened when two monitor can't find match resolution. My laptop's
internal display only has one resolution 1920x1200, external monitor's
highest resolution is 1920x1080. When switching to mirror mode in gnome-
control-center, it will crashed.
** Changed in: gnome-control-center (Ubuntu Lunar)
Status: Incomplete => Confirmed
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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:
New
Status in gnome-control-center source package in Kinetic:
Won't Fix
Status in gnome-control-center source package in Lunar:
Confirmed
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.
1. Connected monitors to system which don't have same resolution.
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]
It only modified the code related to mirror mode in Displays panel. For KK
and LL check variable (best_mode) before using it. For Jammy, modified the way
to find cloning mode and check the variable (best_mode) . The second patch
already included in gnome-42. The risk will be low.
[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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