Comment 40 for bug 1049630

I confirm also to have similar problems on my laptop.It's a Samsung P200 with an ATI X1250, the chipset should be the R600 chipset with installed Ubuntu 12.04 LTS.

In Unity I can see weird lines below the bar
[IMG]http://i46.tinypic.com/2ur55yp.png[/IMG]
[IMG]http://i49.tinypic.com/10hr30y.png[/IMG]

and also I can see font corruptions on the bars of gnome-shell.
[IMG]http://img827.imageshack.us/img827/8899/gnome3.jpg[/IMG]

$ lspci -nn | grep VGA
01:05.0 VGA compatible controller [0300]: Advanced Micro Devices [AMD] nee ATI Radeon Xpress 1250 [1002:7942]

see this on ubuntuforums
http://ubuntuforums.org/showthread.php?t=1967462&highlight=x1250