[Bug 2120413] Re: [SRU]Fix preferred display server has not been retried on start

[Zhaoxuan Zhai]

Hi Daniel,

I have verified 46.2-1ubuntu1~24.04.2, but I will not change the tags.

If you need to re-upload, I can verify again on new package.

If you do not need a new package, could you please help to change the
verification-needed-noble tags?

Thanks!

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Title:
  [SRU]Fix preferred display server has not been retried on start

Status in gdm:
  Fix Released
Status in gdm3 package in Ubuntu:
  Fix Released
Status in gdm3 source package in Jammy:
  In Progress
Status in gdm3 source package in Noble:
  Fix Committed
Status in gdm3 source package in Plucky:
  Fix Released
Status in gdm3 source package in Questing:
  Fix Released

Bug description:
  [ Impact ]

   * On Wayland only devices, when the Wayland display server fails to
     start occasionally, the gdm3 will only retry the unsupported Xorg
     display server instead of Wayland display server.
     The retry mechanism ineffective on these Wayland only devices,
     which in turn causes these devices to be unable to start graphics
     due to an occasional failure.

   * This patch backport from upstream and it will give 5 tries for
     the preferred display server (Wayland on our case).

  [ Test Plan ]

   This patch can be verified on ubuntu Desktop by following these steps:
   * Download attached gdm-crash-test.sh and save it into
     /usr/local/bin/gdm-crash-test.sh
     (This script will emulate a start fail of gdm)
   * Run "chmod +x /usr/local/bin/gdm-crash-test.sh"
   * Edit /usr/share/applications/org.gnome.Shell.desktop.
     Replace the line starts with "Exec=" to:

       Exec=/usr/local/bin/gdm-crash-test.sh
   * Reboot
   * - If this device does not support Xorg display server, you will
       unable to see the Ubuntu login screen.
     - If this device supports Xorg display server, in the Ubuntu login
       screen, you will noticed that Wayland option is unusable.
   * Then, install the test package on system and reboot.
   * With new package, the login screen will show normally, and the wayland
     option is usable.
   
  [ Where problems could occur ]

   * This patch adds 4 extra launch chances for the preferred display server.
     This may increase the delay in gdm selecting a fallback display server
     if the preferred display server is truly completely unavailable.

  [ Other Info ]

   * This patch has just been merged into gdm main branch, and it will be in
     the next gdm release.

   * This bug originally raised by our customer Adventech (LP: #2099664)

   * Upstream Issue: https://gitlab.gnome.org/GNOME/gdm/-/issues/973

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