https://bugs.freedesktop.org/show_bug.cgi?id=76659

--- Comment #8 from Alex Deucher agd5f@yahoo.com --- Does manually turning off the display also cause problems? e.g. run: xset dpms force off xset dpms force on from a terminal

Can you get remote access to the box (e.g., ssh)? If so can you try manually turning the displays on/off? E.g.,

DISPLAY=:0.0 xset dpms force off DISPLAY=:0.0 xset dpms force on

or

DISPLAY=:0.0 xrandr --output DVI-0 --off DISPLAY=:0.0 xrandr --output DVI-0 --auto