Problems with audio device pass-through with the latest xen-unstable

[Tom Rotenberg <tom.rotenberg@gmail.com>]

Hi,

I'm using the latest xen-unstable (changeset:20605:8f304c003af4), and
i found out, that for some reason, there is a problem with audio
pass-through on my Lenovo machines (i have tested it on both Lenovo
X200 & Lenovo T400/T500). The problem is, that fater i pass-through
the audio device (00:1b.0 Audio device: Intel Corporation 82801I (ICH9
Family) HD Audio Controller (rev 03)), to the domU Windows XP, it
doesn't identify any audio/media device. i have made sure, i have the
Microsft UAA high-definition audio bus driver, and i still don't see
any audio device.

It looks like a specific problem, because on a Dell e6400 machine the
audio pass-through works fine.

Does anyone knows about such issue? or can guide me to where the
problem might be?

(BTW - I have read somewhere, that some devices, such as audio device,
and others may be dependent on other pieces of firmware, such as:
SMBIOS, EBDA, etc. in order to work. can this be related to the audio
issue?)

Tom