https://bugs.freedesktop.org/show_bug.cgi?id=99275
--- Comment #22 from Reimar Imhof tuxuser@quantentunnel.de --- I also tried to build a 4.8 kernel with 4.9 drm: git clone -b drm-next-4.9-wip git://people.freedesktop.org/~agd5f/linux freedektop-drm-next-4.9-wip cd freedektop-drm-next-4.9-wip make rpm
That kernel showed no problems.