I'm running 13.04 (64-bit version) but my webcam (Microsoft Lifecam NX-3000) stopped working when I upgraded. I downloaded the 32-bit drivers which fixed it for a while but now it's not recognised in Skype, Cheese or VLC.
Here's the output of lsusb:
Bus 001 Device 002: ID 045e:0721 Microsoft Corp. LifeCam NX-3000 (UVC-compliant)
And here's dmesg | grep uvcvideo:
[ 16.552513] uvcvideo: Found UVC 1.00 device Microsoft LifeCam NX-3000 (045e:0721) [ 16.553854] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround. [ 16.554225] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 26). [ 16.554234] uvcvideo: Failed to initialize the device (-5). [ 16.554996] usbcore: registered new interface driver uvcvideo