The issue won't occur in Lunar. It's only specifically a problem with gdm when
a kernel has been configured this way.
It's not a problem in Jammy yet, but will be a problem when such a kernel gets
backported as HWE.
** Also affects: linux (Ubuntu Lunar)
Importance: Undecided
Status: New
** Also affects: gdm3 (Ubuntu Lunar)
Importance: Undecided
Status: New
** Also affects: nvidia-graphics-drivers-470 (Ubuntu Lunar)
Importance: Undecided
Status: New
** Changed in: nvidia-graphics-drivers-470 (Ubuntu Lunar)
Status: New => Fix Released
** Changed in: linux (Ubuntu Lunar)
Status: New => Won't Fix
** Changed in: gdm3 (Ubuntu Lunar)
Status: New => Invalid
** Changed in: gdm3 (Ubuntu Jammy)
Status: Incomplete => In Progress
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Packages, which is subscribed to gdm3 in Ubuntu.
https://bugs.launchpad.net/bugs/1965303
Title:
Migrate from fbdev drivers to simpledrm and DRM fbdev emulation layer
Status in gdm:
Fix Released
Status in gdm3 package in Ubuntu:
Fix Released
Status in linux package in Ubuntu:
Confirmed
Status in nvidia-graphics-drivers-470 package in Ubuntu:
Fix Released
Status in gdm3 source package in Jammy:
In Progress
Status in linux source package in Jammy:
Won't Fix
Status in nvidia-graphics-drivers-470 source package in Jammy:
Fix Released
Status in gdm3 source package in Lunar:
Invalid
Status in linux source package in Lunar:
Won't Fix
Status in nvidia-graphics-drivers-470 source package in Lunar:
Fix Released
Status in gdm3 source package in Mantic:
Fix Released
Status in linux source package in Mantic:
Confirmed
Status in nvidia-graphics-drivers-470 source package in Mantic:
Fix Released
Status in linux package in Fedora:
Fix Released
Bug description:
[ 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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