This bug was fixed in the package gdm3 - 42.0-1ubuntu7.22.04.4
---------------
gdm3 (42.0-1ubuntu7.22.04.4) jammy; urgency=medium
* Add local-display-factory-skip-simpledrm-when-checking-.patch to
fix a race condition that occurs with simpledrm (LP: #2039757)
-- Mario Limonciello <[email protected]> Tue, 30 Jan 2024 11:28:18
-0600
** Changed in: gdm3 (Ubuntu Jammy)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2039757
Title:
Fix race condition in gdm with simpledrm and real drm drivers
Status in gdm:
Fix Released
Status in gdm3 package in Ubuntu:
Fix Released
Status in gdm3 source package in Jammy:
Fix Released
Bug description:
[ Impact ]
When the kernel has been compiled with FB_EFI=n, FB_VESA=n, SIMPLEDRM=y a
series of events can occur that cause simpledrm to race with GDM. When GDM
loses the race then a user is left with a black screen.
This series of events doesn't currently happen in Jammy kernels, but
can happen from a mainline kernel or HWE kernel that enables it. To
protect users from this circumstance it is better to fix the race
condition.
This issue has been readily reproduced in Ubuntu and reported to upstream
mutter. It's also already fixed in GNOME 45, included in Mantic and later.
https://gitlab.gnome.org/GNOME/mutter/-/issues/2909
[ Test Plan ]
* Ensure that a kernel with required kernel changes can boot to GDM using DRM
driver (amdgpu, i915, or nouveau)
[ Where Problems could occur ]
* GDM can take longer to start up while settling
[ Other Info ]
* Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=2022385
* the changes needed to enable this in the kernel are tracked in bug 1965303
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