I have an ATI Technologies Inc RV280 [Radeon 9200 Pro] video card. I was
experiencing these issues after upgrading to Karmic 9.10.

 * black background under Compiz
 * windows larger than 1024px were black
 * full-screen videos in VLC or Totem were black
 * very choppy (~2 frames per second) full-screen compiz effects (like the 
desktop cube switcher effect, or the scale effect)

The steps in comment #3, to create /etc/modprobe.d/radeon-kms.conf,
fixed the problem for me and returned my system to Jaunty performance
levels.

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(Needs KMS) Background and full screen apps don't show up when Normal Visual 
Effects on (ATI RV100/RV200 chipset)
https://bugs.launchpad.net/bugs/444139
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