[Bug 111122] 2500U: Graphics corruption on kernel 5.2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111122

--- Comment #6 from Nicholas Kazlauskas <nicholas.kazlauskas at amd.com> ---
(In reply to Brian Schott from comment #3)
> I think that I'm seeing something related with my 2700u Inspiron 7375.
> 
> If I have compositing enabled in XFWM4, the system will immediately stop
> responding after logging in with LightDM. If the window manager compositing
> is disabled, I'm able to log in, but then there is graphical corruption.
> 
> With git bisect I traced the problem back to
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/
> ?h=df8368be1382&id=df8368be1382b442384507a5147c89978cd60702
> 
> I can edit the source file, and by only changing the KMS_DRIVER_MINOR
> definition from 32 to 30, get the system working correctly with 5.2.0.

Your issue in particular is likely unrelated - it's an issue in userspace.

The bisected commit is the one that allowed xf86-video-amdgpu to start scanning
out DCC compressed buffers that mesa produces, with the caveat that mesa needs
a hook on present for the re-tile. My guess is that hook isn't running when you
aren't using "compositing".

I'm not sure if mesa or xf86-video-amdgpu have options yet to disable DCC or
not, but for that particular setup you'd probably want it disabled.

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