Fix race condition in gdm with simpledrm and real drm drivers
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
gdm |
Fix Released
|
Unknown
|
|||
gdm3 (Ubuntu) |
Fix Released
|
Undecided
|
Unassigned | ||
Jammy |
Fix Released
|
Undecided
|
Unassigned |
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:/
[ 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:/
* the changes needed to enable this in the kernel are tracked in bug 1965303
Changed in gdm3 (Ubuntu): | |
status: | New → Fix Released |
description: | updated |
Changed in gdm: | |
status: | Unknown → Fix Released |
Hello Mario, or anyone else affected,
Accepted gdm3 into jammy-proposed. The package will build now and be available at https:/ /launchpad. net/ubuntu/ +source/ gdm3/42. 0-1ubuntu7. 22.04.4 in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See https:/ /wiki.ubuntu. com/Testing/ EnableProposed for documentation on how to enable and use -proposed. Your feedback will aid us getting this update out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug, mentioning the version of the package you tested, what testing has been performed on the package and change the tag from verification- needed- jammy to verification- done-jammy. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification- failed- jammy. In either case, without details of your testing we will not be able to proceed.
Further information regarding the verification process can be found at https:/ /wiki.ubuntu. com/QATeam/ PerformingSRUVe rification . Thank you in advance for helping!
N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.