[Xen-users] Xen kernel prevents ALSA working

[xen.mexon@xxxxxxxxxxxxxxx]

I'm using Xen under Debian Etch.  I've managed to get my virtual 
machines working and I'm happy with that.  But I find that if I boot 
Debian using the Xen kernel (version 2.6.18-4-xen-686), ALSA suddenly 
can't find either of my soundcards (an AC97 on the motherboard and an 
M-Audio M44 PCI card).  Everything else seems to work fine, networking 
and bluetooth and so on.  If I revert to the stock 2.6.18 kernel, ALSA 
has no problems.
One thing that I thought could be the problem is the fact that I'm using 
a 686 kernel, when I'm running on an Athlon processor and really should 
be using k7.  Unfortunately Debian doesn't seem to have any Xen kernels 
for k7 at the moment.  But I also tried using the normal 686 kernel, and 
ALSA works fine under that too, so it seems like it shouldn't be a 
problem with the wrong architecture.
I've tried shutting down the xend server, but that doesn't help.

I notice that all the correct kernel modules for my soundcards are 
loaded.  ALSA just doesn't see them, somehow.  It might be that Xen has 
reserved the soundcards for its own use, on the grounds that it might 
need them to provide virtual hardware to its guest OSs.  But googling 
around, it seems Xen doesn't even attempt to provide that kind of 
virtualisation as yet.
Anyone have some hints for me?

Thanks,
Mat

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