I'm pretty sure this is an Xorg issue with the driver and this specific graphics chip. Problem also reported here:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-ati/+bug/755791
I'm pretty sure this is an Xorg issue with the driver and this specific graphics chip. Problem also reported here:
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- ati/+bug/ 755791