[Qemu-devel] [Bug 510612] Re: sound broken in qemu 0.12.x

[Joel Schopp]

** Tags added: windows

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sound broken in qemu 0.12.x
https://bugs.launchpad.net/bugs/510612
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Status in QEMU: New

Bug description:
In qemu 0.12.x there is a jitter when sound is played by guest Windows XP SP2. 
Also there are warnings on console:

alsa: Unexpected state 1
alsa: Unexpected state 1

and qemu tries to eat 100% cpu. According to strace it polls alsa device 
continuously:

futex(0x849e60, FUTEX_WAKE_PRIVATE, 1)  = 1
select(23, [6 10 12 20 22], [18], [], {1, 0}) = 1 (out [18], left {0, 999997})
poll([{fd=18, events=POLLOUT|POLLERR|POLLNVAL}], 1, 0) = 1 ([{fd=18, 
revents=POLLOUT|POLLERR}])
write(2, "alsa: "..., 6)                = 6
write(2, "Unexpected state 1\n"..., 19) = 19

The bug appears with ac97 and es1370 guest sound devices (i didn't test others).

With OSS host sound driver there are no warnings and consumption of cpu by qemu 
is normal, but jitter in the sound is still there.