KVM 1:84+dfsg-0ubuntu11 (Jaunty amd64) has similar symptoms. Once
Windows XP is booted the initial sound is heard and audio playback works
for some time.
Then, at some moment (10-15 minutes after), the audio stops working
while blocking any application that tries to access the audio. The only
way to recover the audio is to reboot the virtual machine. The reboot in
this audio-locked-up case takes time, as each program that operated on
audio device is not exiting voluntarily ("The program is not
responding") and must be killed using "End Now" button.
There is no messages in dmesg or /var/log/daemon.
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Sound dies on amd64 with WinXP guest
https://bugs.launchpad.net/bugs/248628
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