Comment 49 for bug 144745

This has been broken for about a year now. Currently on Ubuntu 13.04. Same deal. Camera is correctly detected when plugged in, modules are loaded, /dev/video0 is created, but no software can actually use it.

uname -a
Linux aardvark 3.8.0-35-generic #50-Ubuntu SMP Tue Dec 3 01:25:33 UTC 2013 i686 i686 i686 GNU/Linux

dmesg:
[ 329.328094] usb 5-1: new full-speed USB device number 3 using uhci_hcd
[ 329.521148] usb 5-1: New USB device found, idVendor=0ac8, idProduct=301b
[ 329.521157] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 329.521161] usb 5-1: Product: PC Camera
[ 329.521166] usb 5-1: Manufacturer: Vimicro Corp.
[ 333.854039] input: gspca_zc3xx as /devices/pci0000:00/0000:00:1d.0/usb5/5-1/input/input12
[ 333.854691] usbcore: registered new interface driver gspca_zc3xx

lsmod | grep gspc
gspca_zc3xx 51016 0
gspca_main 27661 1 gspca_zc3xx
videodev 95806 2 gspca_main,gspca_zc3xx

lsusb
Bus 005 Device 003: ID 0ac8:301b Z-Star Microelectronics Corp. ZC0301 Webcam

ls -al /dev/vi*
crw-rw----+ 1 root video 81, 0 Jan 29 07:17 /dev/video0