Comment # 9 on bug 64867 from Harald Judt

> adding R600_DEBUG=nodma to my environment makes the problem go away...
> Not pretty, but a workaround. Same question though : how could I
> help debugging this?

I confirm this helps; Not against the GPU fault when playing the video, but
against the crashes/hangs when an opengl xscreensaver etc. activates. Thanks
for mentioning the workaround.

I've also applied https://bugs.freedesktop.org/attachment.cgi?id=72794, but it
doesn't help.