Now again I have sound for the laptop, but when connected to the docking station the following happens: First, they didn't wanna install, but then I made a BIOS update from Revision A03 to A18 and it solved the problem. I installed the Sigmatel drivers for Windows Vista 32bit.
The generic Windows sound driver made the sound for the laptop run, but not with the docking station.
I have a Dell Latitude D630 and Windows 8.