i have a problem with installing ATI drivers on Linux. I switched from Windows, because i prefer linux systems.
My miner has 4 HD 5850 with Riser Cards. I freshly installed Ubuntu 10.04 and installed the ATI Proprietary Driver from Ubuntu repository. With 1 Graphics Card installed, Ubuntu runs without any problems.
If I plug in a second card (doesnt matter which card at which PCI slot), i cant boot anymore after aticonfig --initial command. Screen goes blank at the moment, when login screen should appear and PC hangs up. I tried to use STRG ALT F1 to log into console, but doesnt work. It seems that there is a problem with X11 and ATI drivers, but i found nothing in this forum about it.
I have the same problem with Debian 6.06 tesing and Ubuntu 11.04 with Catalyst 11.6. How did you manage to setup these cards under Ubuntu.