[Bug 2026228] Re: gnome-control-center crashed when switching to mirror mode and monitors don't have matched resolution

[Jeremy Bícha]

I am closing the Kinetic task. Ubuntu 22.10 "Kinetic" will be End of
Life on July 20 and there is not enough time under normal Stable Release
Update procedures for this fix to land in kinetic-updates before July
20.

** Also affects: gnome-control-center (Ubuntu Jammy)
   Importance: Undecided
       Status: New

** Also affects: gnome-control-center (Ubuntu Kinetic)
   Importance: Undecided
       Status: New

** Also affects: gnome-control-center (Ubuntu Lunar)
   Importance: Undecided
       Status: New

** Changed in: gnome-control-center (Ubuntu Kinetic)
       Status: New => Won't Fix

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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:
  Confirmed
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:
  New

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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