Display Problem on Dell Latitude CPx H500

I installed Suse 11.2 (KDE) on my Dell Latitude CPx H500GT laptop which has the ATI Mobility M1 Video card. I have a problem with the display. On my desktop I have a 1 cm thick white band running across the screen approx 2.5 cm from the top. Restarts of the system does not clear up the issue. I have searched these forums, and found a couple of references to the same issue, but no posted resolutions. Has anyone else run into this issue and found a fix for it?