https://bugs.freedesktop.org/show_bug.cgi?id=105005
--- Comment #8 from Michel Dänzer michel@daenzer.net --- (In reply to Dmitry from comment #7)
After rebooting done due to this problem. Without the screen it is problematic to do, immediately after.
If you have another computer, you can do it via ssh.
4.14.15-1
Any chance you can use git bisect to isolate the change between 4.14 and 4.15 which introduced the problem?