I upgraded xserver-xorg-video-ati to 1:6.12.192-2 (from debian, build from src on ubuntu) - problem persisted..
when I upgraded kernel to 2.6.33.1 (config from 2.6.32-17.26 generic flavor) - it seems, no more crashing or freezing...
I will try testing more extensively later, to make sure 2.6.33.1 solves the problem...
p.s. I guess it is the time to notify kernel teem
I upgraded xserver- xorg-video- ati to 1:6.12.192-2 (from debian, build from src on ubuntu) - problem persisted..
when I upgraded kernel to 2.6.33.1 (config from 2.6.32-17.26 generic flavor) - it seems, no more crashing or freezing...
I will try testing more extensively later, to make sure 2.6.33.1 solves the problem...
p.s. I guess it is the time to notify kernel teem