A4tech webcam not working

[Łukasz Jernaś]

My A4 Tech webcam "cam note" isn't properly working, it displays just garbage.

Linux betty 2.6.31-0.3 #1 SMP Wed Sep 16 00:37:10 CEST 2009 i686 Intel(R)_Celeron(R)_M_processor_________1.60GHz PLD Linux

dmesg:
[ 1137.923265] usb 3-2: new full speed USB device using uhci_hcd and address 2
[ 1138.111881] usb 3-2: New USB device found, idVendor=0ac8, idProduct=303b
[ 1138.111887] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 1138.111891] usb 3-2: Product: PC Camera
[ 1138.111893] usb 3-2: Manufacturer: Vimicro Corp.
[ 1138.112134] usb 3-2: configuration #1 chosen from 1 choice
[ 1138.493910] Linux video capture interface: v2.00
[ 1138.517180] gspca: main v2.6.0 registered
[ 1138.586982] gspca: probing 0ac8:303b
[ 1140.291511] zc3xx: probe 2wr ov vga 0x0000
[ 1140.333501] zc3xx: probe sensor -> 0011
[ 1140.333509] zc3xx: Find Sensor HV7131R(c)
[ 1140.337755] gspca: probe ok
[ 1140.337788] usbcore: registered new interface driver zc3xx
[ 1140.337792] zc3xx: registered
[ 1155.009961] zc3xx: probe 2wr ov vga 0x0000
[ 1183.987228] zc3xx: probe 2wr ov vga 0x0000

lsusb:
Bus 003 Device 002: ID 0ac8:303b Z-Star Microelectronics Corp. ZC0303 Webcam