The card in question is an ATi Mobility 4570 on an Asus K50AB.
I'm really confused by this. I first noticed it on Arch: the open source driver causes small horizontal lines that seem to rotate across the screen and temperatures IDLE at 90+C for the card.
If I use catalyst (or windows) I have no issues. Idle temps are the high 60s to low 70s.
I figured it was an issue with Arch, so I moved onto Fedora 15. I didn't even get the chance to install it as the issues started once KMS did. On Arch, I attempted going with KMS disabled and even compiled a Kernel without KMS support. All this did was kill off all acceleration. Except with the kernel without KMS...It looked like I got accel but, I was essentially looking at a very slow slideshow.
If I want Gnome-Shell to work I need accel. The Arch forums might was well be a ghost town as I was, for the most part, the only poster.
I'm hoping someone in the Fedora community might have some idea.