** Description changed:
[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.
+ 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]
- 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.
+ 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 modify the way to find cloning
+ mode. This second patch is backported from gnome-control-center 42.
[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)
** Changed in: gnome-control-center (Ubuntu Lunar)
Status: Confirmed => In Progress
** Changed in: gnome-control-center (Ubuntu Jammy)
Status: New => In Progress
** Changed in: gnome-control-center (Ubuntu Jammy)
Assignee: (unassigned) => Dirk Su (dirksu)
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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
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