It happens to me as well sometimes with some games. To avoid it I prefer to kill plasma-desktop task. As I wrote this is only for some games like Megaglest.
What GPU driver have You got installed ? Did You try to install the fglrx driver ?
Here is something You should read if not sure about the asnwers to the above questions : openSUSE Graphic Card Practical Theory Guide for Users
if i install the official ati driver, than linux won’t boot anymore, a total system brick! >:(
NOTE: i know that because i tried it on a LiveUSB, and on an installed openSUSE
i don’t know how to install the ati driver correctly + it says NO compatible adapter found! :sarcastic:
and i play native linux games… no win, for win games i have a second laptop. i won’t install win on my main laptop!!
I think it’s impossible to render a linux unbootable by installing a different GPU driver unless You’re doing something wrong. Well at least I have never managed to do that and I managed to completely destroy my system more than a few times.
Yes this is possible To get back your X You just need to revert to the old driver. Reading the link I gave You earlier will give You an idea on how to do this.
AMD site sure reports there are drivers for Linux for your GPU. AMD Support Search
Please read the install instructions carefully, follow them and I’m sure You’ll figure it out.