https://bugs.freedesktop.org/show_bug.cgi?id=91880
--- Comment #189 from tkdestroyer2+bugs-freedesktop@gmail.com --- I tried what chris suggested, and it worked up until the point at which some X session closes (right after login or after exiting basic xterm test session), where the system locks up. They seem to have patched 4.16.*, which was totally broken before for me on 4.16.2. I guess I'll keep doing my dpm=0 thing for now.