Description of problem:
Running command line qemu-kvm, in my Windows XP Professional sp2 32-bit guest, sound stops working within a few hours using QEMU_AUDIO_DRV=pa, whether using sb16 or ac97 emulation in the guest and whether I run qemu as root or as my unprivileged user.  When using QEMU_AUDIO_DRV=alsa, sb16 emulation drops out also but ac97 does not.  ac97 emulation with the alsa driver has not dropped out a single time for me but unfortunately the sound is choppy and garbled.  Only the alsa driver with ac97 is choppy, sound quality is fine in all other cases up until it drops out. 

Version-Release number of selected component (if applicable):
Currently using qemu-kvm-0.12.3-8.fc13.x86_64, however the problem has existed since installing Fedora 13.

How reproducible:
For me it's reproducible with the above configuration; Fedora 13, command line qemu-kvm and a Windows XP guest.  Different audio driver and guest emulation combinations have no effect other than alsa/ac97 which doesn't drop out but has poor sound quality.

Steps to Reproduce:
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Actual results:


Expected results:


Additional info:

I tried to get some feedback on this (others experiencing this or not?, known issue? likely configuration error?, etc) before filing a bug report by posting the issue to the fedora-virt mailing list in June but got very little response.  Tried the Fedora support forum with the same results.  Disappointing.  Anyway, my script for starting the guest is:

/usr/bin/qemu-kvm \
  -hda ${DIR}/${IMAGE} \
  -vga std \
  -no-quit \
  -no-frame \
  -name "Windows XP" \
  -usb \
  -usbdevice tablet \
  -daemonize \
  -soundhw all \
  -localtime \
  -m 3584 \
  -mem-path /hugepages \
  -monitor telnet:127.0.0.1:4444,server,nowait \
  -net nic,vlan=0,model=virtio,macaddr=00:1b:fc:9a:75:21 \
  -net tap,vlan=0

selinux is running in permissive mode.  I'm running 64-bit Fedora.  I have an Asus M2R32-MVP motherboard with integrated audio, 8gb memory and an AMD Phenom 9950 Quad-Core Processor.  The audio device is:

00:14.2 Audio device: ATI Technologies Inc SBx00 Azalia (Intel HDA)
     Subsystem: ATI Technologies Inc SBx00 Azalia (Intel HDA)
     Flags: bus master, slow devsel, latency 64, IRQ 31
     Memory at f7bf4000 (64-bit, non-prefetchable) [size=16K]
     Capabilities: [50] Power Management version 2
     Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
     Kernel driver in use: HDA Intel
     Kernel modules: snd-hda-intel

Though I use Fedora primarily, I also have Gentoo installed and can dual boot between the two.  Gentoo does not use Pulse Audio by default so I've always used QEMU_AUDIO_DRV=alsa with it.  I have the same problem in Gentoo except however, when I compile kvm-mod into the kernel rather than loading it as a module.  Compiled into the kernel sound quality is good and does not drop out though if I remember correctly, it's sb16 emulation that is stable in Gentoo rather than ac97.  I use sound in the Windows guest for regular events (new email, im, etc).  I don't use it to play music or watch videos so I don't have continuous, sustained sound coming from the guest.