Ludovic Courtès <ludo@gnu.org> writes:

>> The important remaining issue is that Xorg does not start on this
>> computer.  Neither the radeon nor fbdev and not even vesa works, for
>> whatever reason.  fbdev apparently is not supported.  VESA might be a
>> fixable bug (it displays “(EE) VESA(0): Cannot read int vect” like
>> <https://bugs.launchpad.net/xserver-xorg-driver-vesa/+bug/1432899>).
>> On other AMD GPUs the results may be more successful.  I have not
>> tried other free distributions on this PC yet.
>
> So basically GNU/Linux distros in general fail to work on machines with
> these GPUs?

No, many AMD GPUs work well I think.  My AMD Radeon RX 580 works very
well out of the box (minus a few things like hibernation), except with
KMSCON, apparently.

If I understand correctly, there are 3 drivers:

- radeon
- ati
- amdgpu

The latter seems to work fine on recent cards, but it won't work with
older chipsets.
I'm not too sure about the difference between radeon and ati.  

Maybe Florian's issue is with an older card that does not support
"ati" or "amdgpu".

-- 
Pierre Neidhardt
https://ambrevar.xyz/