https://bugs.kde.org/show_bug.cgi?id=357988

--- Comment #16 from Bernd Steinhauser <li...@bernd-steinhauser.de> ---
(In reply to Thomas Lübking from comment #15)
> (In reply to Bernd Steinhauser from comment #14)
> > Around 60 fps, no change there. The left part of glxgears is still updated,
> > the right part is just a static image.
> 
> Well, since it's not kwin specific, we'll have to assume it's in the GL/X11
> driver ;-)
> 
> Since the uncomposited glxgears runs at 60Hz, I assume you've got (flipping
> disabling)
> Option "TearFree" "on"
> set? (Xorg.0.log)
> What about turning that off?
Tried that and if I turn that off and do the above steps, all of my screens go
black which does not seem to be recoverable. I see these messages in my
journal:
Jan 17 15:33:08 orionis kernel: [drm:radeon_dp_link_train] *ERROR* displayport
link status failed
Jan 17 15:33:08 orionis kernel: [drm:radeon_dp_link_train] *ERROR* clock
recovery failed

However that led me to the other option I set for the radeon driver: DRI3.
I switched to DRI2 and this issue is gone. I did see a black screen when
trying, but that was the other Plasma bug. Windows etc. show up on the screen
and can be used.

I'll report a bug upstream.

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