Bug#900087: xserver-xorg-video-amdgpu: AMD RX 550 often locks up

[Moritz Mühlenhoff <jmm@inutil.org>]

On Sat, Jun 23, 2018 at 11:34:58AM -0700, Alan W. Irwin wrote:
> On 2018-06-02 10:07-0700 Alan W. Irwin wrote:
> 
> > The propagation of kernel 4.16.12 from Sid to Buster has greatly
> > improved this situation, i.e., no lock ups so far (uptime approaching
> > 3 days since I switched to 4.16.12 from 4.16.5) and may have
> > completely solved it. [...]
> 
> Well, further experience showed lockups occurred roughly as often for
> 4.16.12 as for 4.16.5.  So currently I am only able to use this
> computer in a reliable way using an X-terminal (an alternate computer
> with a different X server that runs "X -query <name of this computer>"
> to control and display remote desktop results that are running on this
> computer).
> 
> Therefore I plan to wait for kernel 4.17.x (which apparently has many
> graphics fixes for modern AMD cards such as the RX 550) to propagate
> to Buster before I try this computer again with a local X server,
> i.e., direct use rather than X-terminal use.

I'm seeing the same with RX 570 (which according to Wikipedia should
be the same architecture as your RX 550) and the stable Buster release,
both with the standard 4.19 kernel and the 5.2 kernel from buster-backports.

Cheers,
        Moritz