[Bug 1965303] Re: Migrate from fbdev drivers to simpledrm and DRM fbdev emulation layer

This bug is awaiting verification that the linux-gke/6.8.0-1004.7 kernel
in -proposed solves the problem. Please test the kernel and update this
bug with the results. If the problem is solved, change the tag
'verification-needed-noble-linux-gke' to 'verification-done-noble-linux-
gke'. If the problem still exists, change the tag 'verification-needed-
noble-linux-gke' to 'verification-failed-noble-linux-gke'.


If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.


See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: kernel-spammed-noble-linux-gke-v2 verification-needed-noble-linux-gke

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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 linux package in Ubuntu:
Fix Released
Status in nvidia-graphics-drivers-470 package in Ubuntu:
Fix Released
Status in linux source package in Jammy:
Won't Fix
Status in nvidia-graphics-drivers-470 source package in Jammy:
Fix Released
Status in linux source package in Lunar:
Won't Fix
Status in nvidia-graphics-drivers-470 source package in Lunar:
Fix Released
Status in linux source package in Mantic:
Won't Fix
Status in nvidia-graphics-drivers-470 source package in Mantic:
Fix Released
Status in linux source package in Noble:
Fix Released
Status in nvidia-graphics-drivers-470 source package in Noble:
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

[ Test Plan ]

* Ensure that systems currently relying on fbdev (and therefore only
allowing Xorg logins) such as some virtual machine types, boot with
working Wayland support.

[ Where Problems could occur ]

* 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 (bug 2039757).
* 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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