Does it work any better with my drm-next-4.8-wip branch: https://cgit.freedesktop.org/~agd5f/linux/log/?h=drm-next-4.8-wip and the new smu firmware here: http://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/commit/?id=9693ff6d749dcf1dfd81f0f6b227ab07a3d76c90