No VGA out from docking station

I have a Dell Latitude C800. I like to run it inside of its docking station. The docking station has a vga out port connected to a monitor. During the boot process I see everything on my monitor, but as soon as the openSUSE 11.0 graphics system kicks in, nothing is sent to the vga port.

Is there a piece of support software for docking stations? Help with this will be appreciated.