assigned EHCI USB headset not working

["André Weidemann" <Andre.Weidemann@web.de>]

Hi,
I am using latest clone from qemu-kvm git with kernel 2.6.35.7.

Since assigning PCI soundcards, did not yield any usable results, I 
assigned a USB headset to a Windows7 VM.
I used the following two command lines to enable the EHCI controller 
inside the VM and to assign the device to it:

...
-device usb-ehci,id=ehci \
-device usb-host,vendorid=046d,productid=0a01,bus=ehci.0 \
...

Right after starting the VM I see the following output:
...
Booting from Hard Disk...
Booting from 0000:7c00
husb: config #1 need 1
husb: 2 interfaces claimed for configuration 1
husb: config #1 need 1
husb: 2 interfaces claimed for configuration 1
husb: config #1 need 1
husb: 2 interfaces claimed for configuration 1
husb: config #1 need 1
husb: 3 interfaces claimed for configuration 1
husb: config #1 need 1
husb: 3 interfaces claimed for configuration 1
husb: config #1 need 1
husb: 3 interfaces claimed for configuration 1
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
USB stall
husb: config #1 need 1
husb: 2 interfaces claimed for configuration 1


"info usb" on the monitor looks like this:

   Device 0.1, Port 1, Speed 1.5 Mb/s, Product Microsoft Wireless 
Desktop Rece
   Device 1.1, Port 1, Speed 480 Mb/s, Product Logitech USB Headset


The sound device shows up under Windows7 and drivers are installed 
automatically. Unfortunately it does not work. All the players I tried, 
did not even start playing the sound file, although they detected the 
DirectSound Device.

When connected to a "natively" running Windows7, the USB headset works 
the way it's supposed to.


Any help is greatly appreciated.

Regards
  André