https://bugs.freedesktop.org/show_bug.cgi?id=57990
--- Comment #2 from Rubén Reina ruben.reina.dev@gmail.com --- 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.