That's not something I'm sure about, it was working at one time, but then it broke when I upgraded my Ubuntu to 12.04. I had tried both installing Ubuntu new (64 bit 12.04) (on a spare hdd, no other hdd's installed) and did the auto install from downloaded catalyst driver, the build packages option, and the Ubuntu default driver install.
However, I've found it better to separate my 3d/gaming work on windows to my other crap on Ubuntu (lots of music, pics, testing interesting linux apps etc...) so I'm happy leaving it as it is.
I was not intending any offense to anyone (hopefully I didn't) I just said what I had experienced on both. Perhaps I will try again with 12.10 once I've backed up my new files.
Well, easy. Go nVidia route, and you're good to go