More clues - from syslog after toggling the webcamm off and back on:

Jul  8 23:09:15 damselfish kernel: [ 2974.996483] usb 1-8: USB disconnect, address 4
Jul  8 23:09:15 damselfish kernel: [ 2975.385458] usbcore: deregistering interface driver uvcvideo
Jul  8 23:09:23 damselfish kernel: [ 2982.907724] Linux video capture interface: v2.00
Jul  8 23:09:23 damselfish kernel: [ 2982.924462] usbcore: registered new interface driver uvcvideo
Jul  8 23:09:23 damselfish kernel: [ 2982.924486] USB Video Class driver (v0.1.0)
Jul  8 23:09:23 damselfish kernel: [ 2983.229095] usb 1-8: new high speed USB device using ehci_hcd and address 5
Jul  8 23:09:23 damselfish kernel: [ 2983.405246] usb 1-8: configuration #1 chosen from 1 choice
Jul  8 23:09:23 damselfish kernel: [ 2983.407100] uvcvideo: Found UVC 1.00 device CNF7129 (04f2:b071)
Jul  8 23:09:23 damselfish kernel: [ 2983.409012] input: CNF7129 as /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/input/input12
--
Dazed_75 a.k.a. Larry

The spirit of resistance to government is so valuable on certain occasions, that I wish it always to be kept alive.
 - Thomas Jefferson