I have a laptop running Xubuntu 12.10 x64, and also Steam beta. Valve recommends using official graphics drivers, and thus I need to install Ati 12.6 drivers. Because the newest Xorg is not supported by this driver, I needed to downgrade. After some headaches I used this tutorial: http://xubuntugeek.blogspot.cz/2012/10/solved-amd-catalyst-and-ubuntu-1210.html But after doing this Xubuntu now hangs on a black screen after grub. Numlock and capslock do not work. Any solutions?