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

I have no way of testing Nvidia Tegra.

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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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