I have Radeon Mobility x1600 and had the same problems with freezing.
After installing kernel from http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.29.2/ and all freezes with compositing "on" are gone. It is working.
I have Radeon Mobility x1600 and had the same problems with freezing.
After installing kernel from http:// kernel. ubuntu. com/~kernel- ppa/mainline/ v2.6.29. 2/ and all freezes with compositing "on" are gone. It is working.