https://bugs.freedesktop.org/show_bug.cgi?id=99275
--- Comment #21 from Reimar Imhof tuxuser@quantentunnel.de --- at https://bugzilla.kernel.org/show_bug.cgi?id=193651#c8 I found the hint about drm-next-4.11-wip. I build that kernel but still had the same bug.