I've uploaded the jammy backport of this patch into the queue, so
assigning it to myself. As I have readily seen this problem on my own
test kernels I'll validate it with a local kernel with the matching
kconfig options when it's accepted. This can then be done in advance of
waiting for matching changes landing in OEM-6.5, or HWE-6.5.
** Changed in: gdm3 (Ubuntu Jammy)
Status: Triaged => In Progress
** Changed in: gdm3 (Ubuntu Jammy)
Assignee: (unassigned) => Mario Limonciello (superm1)
** Description changed:
- [ Impact ]
+ [ Impact ]
The fbdev subsystem has been deprecated for a long time. We should drop it in
favour of using simpledrm with fbdev emulation layer.
This requires Kernel config changes:
FB_EFI=n
FB_VESA=n
fbcon will still require FB to be available, but will use the fbdev
emulation layer
When this stack is enabled, it changes boot timing such that some
drivers may take a longer time to boot and GDM may hang in a black
screen.
+ This issue has been readily reproduced in Ubuntu and reported to upstream
mutter.
+ 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 ]
* Race conditions could be exposed to DE environments
* Software that expects to find DRM device at /dev/dri/card0 may have a
problem.
* Some older versions of NVIDIA driver might not work properly.
[ Other Info ]
* Fedora bug: https://bugzilla.redhat.com/show_bug.cgi?id=2022385
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https://bugs.launchpad.net/bugs/1965303
Title:
Migrate from fbdev drivers to simpledrm and DRM fbdev emulation layer
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