I use Debian 64 bit and now i have the 3.11rc4 kernel installed, with mesa from
git, xf86-video-ati from git, libdrm from git, all firmwares put in
/lib/firmware.
The hardware is A8-5500 desktop APU with its built in 7560D card.
The system works very well, opengl, vdpau is functional.

I have xscreensaver set to turn off the monitor after 4 minutes, which it does.
I can wake up after a few minutes by moving the mouse or pressing a key.

All is going well until i leave the computer for a longer time (it varies,
usually a few hours) - the computer becomes totally unresponsive, doesnt react
to keyboard/mouse and network wise is totally dead. The fans are on normally,
no disk activity. I have to reset it from the reset button.
Nothing out of the ordinary in any logs, they just stop logging, presumably
when the computer freezes.

Now if i disable dpms and leave only blanking, this doesnt happen (This is why
i think it has to do with the kernel driver), but this mean the monitor is on
all the tme which isnt good since the computer runs 24/7.

PS. It didnt happen previously with the fglrx driver in any circumstances.

Any ideas why this might happen?