jag fixade det själv:
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For users with an ATI video card: certain cards have trouble rendering games and video in opengl using current flgrx drivers which will cause your computer to hard locks when you attempt to enter a domain. This error will occur just after character creation/selection, as the game environment is loading, or possibly after a short period of play. In order to fix this error, add the following three lines of code to your xorg.conf file in the ATI device section:
Option "Capabilities" "0x00000800"
Option "UseFastTLS" "off"
Option "KernelModuleParm" "locked-userpages=0"
You edit the file by doing this command:
gksudo gedit /etc/X11/xorg.conf
The section should look something similar to this after editing:
Section "Device"
Identifier "aticonfig-Device[0]"
Driver "fglrx"
Option "Capabilities" "0x00000800"
Option "UseFastTLS" "off"
Option "KernelModuleParm" "locked-userpages=0"
EndSection
WoW fungerar nu utan några som helst problem, tack för länkarna DeepThought

btw, detta var första gången jag gjorde en lyckad ändring i xorg.conf
