https://bugs.freedesktop.org/show_bug.cgi?id=103489
--- Comment #3 from oschowa@web.de --- I did a new kernel build with the most recent patches from agd5f/drm-next-4.15-dc applied and the issue persists. But then I manually reverted
c196cbe065da drm/amd/display: add dpms state to DC follow up and d050f8ed1449 drm/amd/display: add dpms state to DC
and the issue seems to be gone.