Comment # 3 on bug 57990 from Alex Deucher

(In reply to comment #2)
> I had to format the system because I didn't know how to go back to an older
> version. I'm using this ppa
> https://launchpad.net/~oibaf/+archive/graphics-drivers/. Maybe here you can
> see the problem, I think the package is xserver-xorg-video-ati.
> 
> I'm sorry I'm a bit unexperienced in Linux. Just trying to learn.

If you update xserver-xorg-video-ati to version 7.0.0 or newer, you either have
to also have to update your mesa package 9.0 or newer, or add:
Option "ColorTiling2D" "False"
to the device section of your xorg.conf