Changing to confirmed since the reporter has provided the requested
information.
I too am experiencing this bug. Looking at the libvirt source code, it
specifies QEMU_AUDIO_DRV=none whenever using VNC for graphics. The
comments say this is because it tunnels audio over the VNC connection.
/* QEMU implements a VNC extension for providing audio, so we
* set the audio backend to none, to prevent it opening the
* host OS audio devices since that causes security issues
* and is non-sensical when using VNC.
*/
ADD_ENV_LIT("QEMU_AUDIO_DRV=none");
However, the VNC viewer that virt-manager uses apparently doesn't
support the audio extension. That's why sound is broken.
(http://osdir.com/ml/fedora-virt/2010-01/msg00006.html)
--
QEMU_AUDIO_DRV set to none by libvirtd in Lucid
https://bugs.launchpad.net/bugs/591489
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