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 |
New
|
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 |
