Problem with resolution using ATI Radeon Mobility

Installed openSUSE 11.1 on a Dell Latitude C610. Trying to set resolution to 1280x1024 but settings seem locked at 800x600. At login screen the resolution is what I want, but after I login it changes back to 800x600. My graphics card is ATI Radeon Mobility (not sure what model exactly) and I tried getting the binary from ATI’s website, I’m not sure its the one I need but I installed it nevertheless. Though in the graphics card and monitor section of yast it says my card is ati radeon ly. Could anyone help me out please? I’m hoping to get this fixed before school starts next week.

Try catalist driver , if doesn´t work , look for your exact mobility model

ATI Catalyst™ 8.12 Proprietary Linux x86 Display Driver