Same problem on dell inspiron 1525 after upgrade to 9.10
Have someone tried to install latest UVC module from svn as described here
http://ubuntuforums.org/archive/index.php/t-793513.html

Logs:

[   38.999970] uvcvideo: Found UVC 1.00 device Laptop Integrated Webcam 
(05a9:2640)
[   39.013060] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. 
Enabling workaround.
[   39.013413] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 
26).
[   39.013418] uvcvideo: Failed to initialize the device (-5).
[   39.013465] usbcore: registered new interface driver uvcvideo
[   39.013468] USB Video Class driver (v0.1.0)

$ sudo rmmod uvcvideo
$ sudo modprobe uvcvideo

[33516.280832] usbcore: deregistering interface driver uvcvideo
[33873.216755] uvcvideo: Found UVC 1.00 device Laptop Integrated Webcam 
(05a9:2640)
[33874.216880] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. 
Enabling workaround.
[33874.217624] input: Laptop Integrated Webcam as 
/devices/pci0000:00/0000:00:1a.7/usb1/1-1/1-1:1.0/input/input15
[33874.217749] usbcore: registered new interface driver uvcvideo
[33874.217759] USB Video Class driver (v0.1.0)

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uvcvideo module randomly fails to load
https://bugs.launchpad.net/bugs/241753
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