Webcam no longer works after libpam update

After a recent upgrade on 11.04 to libpam and associated files from 1.1.1-2ubuntu8.2 to 8.3, my laptop (Dell XPS M1330) built-in webcam no longer works. Below extract from syslog before and after the event.

BEFORE
Jun 1 13:59:30 Inverness kernel: [ 12.935708] uvcvideo: Found UVC 1.00 device Laptop Integrated Webcam (05a9:7670)
Jun 1 13:59:30 Inverness kernel: [ 12.937666] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
Jun 1 13:59:30 Inverness kernel: [ 12.939511] input: Laptop Integrated Webcam as /devices/pci0000:00/0000:00:1d.7/usb2/2-6/2-6:1.0/input/input7
Jun 1 13:59:30 Inverness kernel: [ 12.939701] usbcore: registered new interface driver uvcvideo
Jun 1 13:59:30 Inverness kernel: [ 12.939704] USB Video Class driver (v1.0.0)

AFTER
Jun 1 14:34:30 Inverness kernel: [ 12.591305] uvcvideo: Found UVC 1.00 device Laptop Integrated Webcam (05a9:7670)
Jun 1 14:34:30 Inverness kernel: [ 12.592594] uvcvideo: UVC non compliance - GET_DEF(PROBE) not supported. Enabling workaround.
Jun 1 14:34:30 Inverness kernel: [ 12.592700] uvcvideo: Failed to query (129) UVC probe control : -32 (exp. 26).
Jun 1 14:34:30 Inverness kernel: [ 12.592707] uvcvideo: Failed to initialize the device (-5).
Jun 1 14:34:30 Inverness kernel: [ 12.595167] usbcore: registered new interface driver uvcvideo
Jun 1 14:34:30 Inverness kernel: [ 12.595170] USB Video Class driver (v1.0.0)

Any solution to get my webcam working again appreciated.