Comment 47 for bug 1900854

1)
https://gitlab.freedesktop.org/xorg/driver/xf86-video-ati/-/issues/192

2) It is also occurs on 19.10,
I don't remember any working setup,
may I try under windows 10
or could it be a hardware problem ?

Extra info, displaying videos in firefox is not causing any issue,
I suspect it uses different acceleration.