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

From: Michael Tokarev
Subject: [Qemu-devel] [Bug 510612] Re: sound broken in qemu 0.12.x
Date: Sun, 15 Aug 2010 21:30:26 -0000

Isn't it the case that's fixed by commit
d9812b033a17c82f9e933757c1c3ef364e3ba62d as shown in
http://comments.gmane.org/gmane.comp.emulators.qemu/72593 which is
actually this very bugreport mirrored to qemu-devel mailinglist?

sound broken in qemu 0.12.x
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Status in QEMU: New
Status in “qemu” package in Debian: 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 

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, 
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.

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