(Solved) Graphical glitches with ATI

[Urkle]

disabling in the Xorg config shouldn't make a difference (as even though the feature is "available" if no application enabled it it's not in use.)

Have you tried running at different resolutions? I know there was some issues documented before that if you didn't run at the correct resolution for your monitor, things wouldn't render correctly on ATI. I recall this from the mac port on my laptop which has a wide screen monitor and I had to use the correct wide screen resolution with the right aspect ratio.