* logitech quickcam express doesn't work -- light goes on inCheese/skype, but not image
I don't know about it specifically, but when I use my USB microscope I use Camorama. Notice though it has no UI to select device, you have to give a switch --device=/dev/video1 on commandline if it's not the first video device. It also might be worth a try.
Found this 1 year old kernel bug, it affects several cameras
https://bugzilla.redhat.com/show_bug.cgi?id=564597
https://bugzilla.redhat.com/show_bug.cgi?id=564597
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