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

--- Comment #9 from André Wöbbeking Woebbeking@web.de --- Hi, I think that I've the same problem.

I've a "ATI Radeon XPRESS 200M 5975 (PCIE)" (ChipID = 0x5975) (from Xorg.0.log).

Here already DISPLAY=:0.0 xset dpms force off brings the screen back.

I'm running Kubuntu 14.04 32 bit.

Cheers, André