I’m stumped.
I have a virtual usb controller that works pretty darn well in our xen
based VMs, but the other day somebody plugged a logitech usb headset into a
win8 vm and the speaker and microphone audio endpoints never showed up in
the windows ui.
Other non-logitech usbaudio devices are working just fine. The same device
connected to the same virtual usb controller in win7 works just fine.
The usb device is apparently fully functional. I say that as it shows up in
device manager, usbaudio is happily instantiated for its audio interface,
the hid device is also present, and if I use graphedit from the WDK tools,
I can push an mp3 out the render pin and it plays on the headset speakers.
As far as I can tell, the only malfunction is that it doesn’t show up in
the user mode enumeration of audio endpoints. I have no clue where to start
looking.
Mark Roddy
Read all its descriptors using Usbview under non-VM, and then under VM.
Does it work under non-VM Win8?
yeah it works fine on a physical win8. Plus it works in a win8 vm from
graphedt, and it works from a win7 vm. The fact that it works from graphedt
is what stumps me. I’d be happier if it didn’t work at all 
Mark Roddy
On Fri, Jan 24, 2014 at 11:20 AM, wrote:
> Read all its descriptors using Usbview under non-VM, and then under VM.
>
> Does it work under non-VM Win8?
>
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Do USB descriptors look the same under VM as outside of VM?