LinuxQuestions.org - USB forwarding using Xen

Hello

I have a USB-webcam and I would like to use it in one of my Xen-Udomains. I added the following the the configuration file of my Udomain...

Code:

usb=1

usbdevice='host:046d:0991'

...where "046d:0991" is displayed by lsusb in my dom0...

Code:

dom0 ~ # lsusb

Bus 004 Device 001: ID 0000:0000  

Bus 008 Device 001: ID 0000:0000  

Bus 003 Device 001: ID 0000:0000  

Bus 006 Device 001: ID 0000:0000  

Bus 007 Device 001: ID 0000:0000  

Bus 002 Device 002: ID 046d:0991 Logitech, Inc. 

Bus 002 Device 001: ID 0000:0000  

Bus 005 Device 001: ID 0000:0000  

Bus 001 Device 002: ID 05e3:0605 Genesys Logic, Inc. USB 2.0 Hub [ednet]

Bus 001 Device 001: ID 0000:0000  

Bus 001 Device 003: ID 04a9:220c Canon, Inc. CanoScan D1250U2

(the "Logitech" line), but after starting up my Udom and issuing "lsusb" I don't see anything at all.
Any clue?
On the dom0 I am using Xen & Xen-tools 3.1.2, while on the domU they're still on version 3.1.1. The Kernel is for both 2.6.20.
Thank you & greetings!