This bug was fixed in the package gdm3 - 48.0-1ubuntu1.1
---------------
gdm3 (48.0-1ubuntu1.1) plucky; urgency=medium
[ Zhaoxuan Zhai ]
* Add retry_preferred_display_server_before_fallback.patch to fix
the problem that the existing retry strategy cannot retry the preferred
session when the preferred session accidentally crashes during startup
(LP: #2120413)
[ Daniel van Vugt ]
* Add local-display-factory-Match-simpledrm-in-a-substring-inst.patch to
ensure the login screen does not start before the real DRM kernel driver
is loaded. (LP: #2115451)
-- Daniel van Vugt <[email protected]> Thu, 14 Aug 2025
13:28:01 +0800
** Changed in: gdm3 (Ubuntu Plucky)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2120413
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:
In Progress
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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