Public bug reported:
[ 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
** Affects: gdm3 (Ubuntu)
Importance: Undecided
Assignee: Zhaoxuan Zhai (kxuan)
Status: New
** Changed in: gdm3 (Ubuntu)
Assignee: (unassigned) => Zhaoxuan Zhai (kxuan)
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https://bugs.launchpad.net/bugs/2120413
Title:
[SRU]Fix preferred display server has not been retried on start
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