Hi Tim,

On Sat, Feb 01, 2020 at 04:44:07PM +0000, Tim Wallace via Dng wrote:
> Hi Andreas--
> lspci shows this:01:00.0 VGA compatible controller: Advanced Micro
> Devices, Inc. [AMD/ATI] Cape Verde GL [FirePro W4100]which shows the
> Cape Verde but not the Southern Island.  I think all Cape Verde are
> that, though.

Yes, Cap Verde is Southern Island generation. So we basically have the
same card.

> The old radeon kernel module paired with the Xorg radeon driver is the
> one that gives random annoying flashes. I can almost live with them, but
> under virtualbox win7 which my wife runs once a week it is unbelievably
> flashy!

Maybe it is something completely different: At work I had similar issues
with my monitor attached to the notebook dock. From time to time, the
monitor turned black for short time and immediately recovered the image.
It seemed to align with some other employees switching on or off some
devices in the first place, but in the end turned out to be a loosely
fitted display port plug. Could it be the cable? I also heard that in
some cases a bad or insufficient display port cable led to unstable
monitor operation.

It could be also a DP link training issue

> The newer amdgpu module fails to work with the Xorg amdgpu driver. 
> This is with ascii, beowulf, and kernels 4.9, 4.19, and 5.4.  I'm able
> to get them installed, they just won't start.  The Xorg amdgpu version
> is 18.1, from late 2018, and a 19.1 is out, from 2019, but claims only
> minor tweaks.  I'm not thinking it's worth bothering to try to compile
> that.

Hmm strange. I was using standard beowulf Xorg package with self compiled
kernel 5.4.7's amdgpu module here without any issues.

cheers,

Andreas

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