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 -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to the bug report. https://bugs.launchpad.net/bugs/556782 Title: [rs690m] Graphics corruption with ati x1200 To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/556782/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp