Dirk,
sometimes when windows detects new hardware on a write-protected image, it
needs to reinstall it on boot.
For USB controllers this is usually on a 10-15 minute cycle. It may use a
similar service startup cycle for audio hardware.
Is your Vista image in 'snapshot=off' mode?
Simon
----------------------------------------
> From: dirk.heinri...@altum.de
> To: kvm@vger.kernel.org
> Subject: Audio starts working several hours after starting Windows Vista guest
> Date: Sun, 30 Sep 2012 09:34:06 +0200
>
> Hello,
>
> since a week or two, I have a very strange problem with audio output on a
> Windows Vista guest. Right after booting the guest, audio does not work. If I
> leave the guest running for some hours (don't know how many, I usually try
> again next day), audio output works fine.
>
> I'm using es1370 emulation, but I get the same results with the other
> alternatives, too.
>
> Guest: Windows Vista SP1 32bit
>
> Host: Ubuntu 12.10 64bit
> % dpkg --list|grep -e kvm -e qemu
> ii kvm-ipxe 1.0.0+git-3.55f6c88-0ubuntu5
> all PXE ROM's for KVM
> ii qemu-common 1.2.0+noroms-0ubuntu2
> all qemu common functionality (bios, documentation, etc)
> ii qemu-kvm 1.2.0+noroms-0ubuntu2
> amd64 Full virtualization on supported hardware
> ii qemu-kvm-spice 1.2.0-2012.09-0ubuntu1
> amd64 Full virtualization on amd64 hardware
> ii qemu-utils 1.2.0+noroms-0ubuntu2
> amd64 qemu utilities
>
> Is this a known problem? What could I do to resolve it?
>
> Thanks...
>
> Dirk
> --
> Dirk Heinrichs <dirk.heinri...@altum.de>
> Tel: +49 (0)2471 209385 | Mobil: +49 (0)176 34473913
> GPG Public Key C2E467BB | Jabber: dirk.heinri...@altum.de
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