Mobility radeon 9000 + TV-out

I have a Dell Latitude D600 Laptop with an ATI Mobility Radeon 9000 (rv250). Now I’m trying to get my TV-out to work in opensuse 11.0. When I’m using the TV-out there seems to be a signal so I can see hints of my Desktop on the TV-screen. But I can’t get it work properly. Resolution changes are only makeing it worse. Maybe someone has an idea.