I installed steam when I was using the radeon driver and the steam client works ok. So I installed the catalyst driver and when I try run steam the screen turns black and the system go to gdm (not even running in the terminal to see what the error is) . I try run urban terror and the same error occurs.
I need help with tearing on the open source radeon driver. I have finally switched on my AMD GPU after upgrading to Ubuntu 13.10 (which uses Linux 3.11) and setting radeon.dpm=1, but I have tearing when I run Steam games that I couldn't fix after spending hours Googling for a solution.