I remember the last time I tried installing Ubuntu on this machine. After installing the "recommended" drivers, the desktop was completely unusable; massive tearing everywhere, multiple overlaid images, etc. I also remember having way less than 60 fps on Killing Floor, where in Windows it usually never goes below 100 fps.
Has anyone gotten an HD6850 to run decently under Linux? I'm using a VGA monitor with a DVI->VGA adapter, if it matters.