Xawtv - Helpp appreciated

Thanks for reading this, would be grateful for any thoughts on the matter.

I run knoppix from the cd, when I launch xawtv without my USB webcam my TV card is found, I can tune in and get the full range of TV stations. Conversely, when I launch with the webcam (connected via 4 port hub), I can only get the cam image on all channels, and in the setup box I am only offered the cam as the only video source, the TV card is not found at all. :cry:

Any ideas how to run the TV card without having to discoonect the webcam?

TIA