Howto Use Logitech Usb Webcam?

I have a supported webcam, attached to a USB port. The camera works in Windows.
I'm running opensuse 10.3.
I have a device /dev/video0.
Permissions seem ok, and I'm a member of group "video".
The webcam's readylight does not come on.
When I launch xawtv or vlc or... I get a "picture" that's just random static and rolling color bars.
Naturally, I've run through program settings like PAL/NTSC, interlace/de-interlace, etc., with no change.

How can I trace back to determine if the viewing programs are getting the right input "device" for capture?
How can I tell if /dev/video0 is actually the USB webcam?

If it matters, my machine is old and my video card is an old ATI Rage 128.

Thanks,

ID

have you installed the drivers ? if not, enable the webcam repository in YaST & install gspca driver. that should sort you out