https://bugs.freedesktop.org/show_bug.cgi?id=39683
--- Comment #2 from Alex Deucher agd5f@yahoo.com 2011-07-30 11:09:21 PDT --- When testing dpms, try something like this: sleep 5; xset dpms force off so that you avoid any late input events that might come in after turning that displays off that might make then come back. Please also attach your xorg log and dmesg output.