Comment 52 for bug 541501

I'v had some similar problems in a ATI radeom Mobility X1400 [rv515].
For me the problem was during a guest or second session. [my whole screen would shiver in a guest session]
If i used the new_pll=0 quirk the new_pll=0 the problem was delayed for ~6hrs. After which i would notice the problem again.

+ I had additional problems where when system was running for long hours , the memory usage was a bit high [gem objects unrelated] and CPU usage by Xorg would spike with wallpaper changes .. and a couple of other problems where Xorg CPU usage would spike.

I installed mainline kernel .33.3 from > http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.33.3-lucid/

And I'm not having any problems now. I dont used the new_pll=0 even. Several problems i was having are solved too.