Comment 3 for bug 859388

I have exactly the same problem.

My environment:

[machine]
M/B: ASUS P5Q, CPU : Intel Core2 Duo E8500
Videocard: ATI Radeon HD 4870(RV770)

[release]
Oneiric beta2 (continued to update from alpha2)

[unity-version]
4.16.0-0ubuntu2

[compiz-version]
1:0.9.5.94+bzr20110919-0ubuntu1

[video driver]
xserver-xorg-video-radeon 1:6.14.99~git20110811.g93fc084-0ubuntu1

[Mesa/OpenGL]
Gallium 0.4 on AMD RV770 2.1 Mesa 7.11