[Bug 108221] amdgpu: mouse cursor flickers + black boxes

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=108221

--- Comment #14 from Fred Santos <frederic.santos@u-bordeaux.fr> ---
(In reply to Michel Dänzer from comment #10)
> (In reply to Fred Santos from comment #9)
> > (Is there a way to 'force' the use of amdgpu?)
> 
> Yes, you can force it in Section "Device" in /etc/X11/xorg.conf . If there
> is no such file yet, creating it with only something like this should work:
> 
> Section "Device"
>         Identifier "Device0"
>         Driver  "amdgpu"
> EndSection

I compiled and booted some old kernels, and here are my observations:

1. Even when booting with old kernels that should have worked fine (e.g., 4.2),
the problem persists...

2. We found (Comment #10) that amdgpu was not found/activated during boot: when
'forcing' its use by creating this /etc/X11/xorg.conf file, everything is OK,
with all kernels I have tested (4.4, 4.3, 4.2). To put it in a nutshell, no
matter the kernel we use, we have the same behavior: it works if and only if we
add this /etc/X11/xorg.conf file.

Maybe an Xorg autodetection problem that doesn't come from the kernel itself?
(Is it possible?)

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