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Re: [Qemu-devel] pcm.c:7843:(snd_pcm_recover) underrun occurred
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] pcm.c:7843:(snd_pcm_recover) underrun occurred |
Date: |
Thu, 21 Nov 2013 09:33:33 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Wed, Nov 20, 2013 at 09:39:26PM +0100, Francesco Turco wrote:
> I'm not sure if asking in qemu-devel is the right thing to do, as
> I'm not a QEMU developer, but stefanha in the #qemu IRC channel told
> me to do so. :-)
>
> I'm running QEMU 1.6.1 on a 64-bit Gentoo Linux system. The guest
> operating system is Windows 7 32-bit. I get multiple identical
> warning messages when using the ac97 or hda sound cards:
>
> > ALSA lib
> > /var/tmp/portage/media-libs/alsa-lib-1.0.27.2/work/alsa-lib-1.0.27.2/src/pcm/pcm.c:7843:(snd_pcm_recover)
> underrun occurred
>
> The difference between ac97 and hda is that the former works well,
> while the latter causes the sound to be garbled.
>
> /var/tmp/portage is the directory where Portage, the Gentoo package
> manager, builds programs. I don't know why it is mentioned in the
> error message.
>
> I also don't know if this is an ALSA problem or a QEMU problem.
>
> The command I use is:
>
> > qemu-system-i386 -cpu host -m 1G -k it -drive
> file=~/QEMU/windows-7.img,media=disk,index=0 -vga std -net nic -net
> user -enable-kvm -display sdl -soundhw ac97
>
> My real sound card is an Intel HD Audio:
>
> > lspci | grep "Audio device"
> > 00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD
> Audio Controller (rev 02)
Extra info from IRC discussion:
The guest is just playing system sounds. This is *not* a real-time
audio app with low-latency settings that easily hits underruns.
Stefan