Reading the thread here http://forums.fedoraforum.org/showthread.php?t=198731
my problem may be related, though I am using fedora 8.
I have a PC running a HD2400Pro. I have been using the livna repository which I have got fglrx from. Recently an update came updating xorg.
The update did nothing immediatly (i'm guessing I had to reboot X). The next day I booted the machine everything started up normally. In fact things started better than normal because the ATi catalyst control panel acutally remembered my "Big Desktop" settings.
Then I decided to drag a window across the screen. The result is a lovely slow render of the window jumping across the screen.
Fire up a web browser. All scrolling is now happening the same as screen rendering. Unnacceptably slow.
Watching a CPU monitor I have I am noticing whenever I scroll a window or move a window my CPU usage hits 100% and stays there until the window stops moving.
So I am assuming, though am open to being corrected, that the GFX card is not being used to render the screen, just to output it.
Is there any other information that would help someone diagnose the problem, or should I try following the advice at http://forums.fedoraforum.org/showthread.php?t=189227
which is advice on how to get fglrx, Fedora 9 and OpenGL working. Does/Can this at all apply to fedora 8.