I have tried a few different program, and cheese is the only one that detect my webcam. it is built on top of the LCD display, I believe it is still using USB bus. However, for strange reason, only IM (eg. aMSN) and cheese can "see" the webcam.
I guess I have to hope the next cheese release can be better. right now there are number of problems with it, including:
1. out of sudden, the display from cheese changed to complete rubbish.
2. cheese freeze up, had to "kill" it.
3. similar to #1, but half the display got trashed.
4. really low FPS.
aMSN seems good so far.
The difference between genius and stupidity is that genius has its limits.
-- Albert Einstein