Hi,
ok, after some testing: the problem is actually that the libvirt-qemu
user is not allowed to access some files. I've not tracked down exactly
which ones are the problem, but when I run
kvm -hda x.img -cdrom ubuntu_precise-desktop-amd64.iso -m 1G \
-smp 2 -vnc :1 -device AC97,id=sound0,bus=pci.0,addr=0x4
as user serge or user root, it works. If as root si do
sudo -u libvirt-qemu -- kvm -hda x.img -cdrom \
ubuntu_precise-desktop-amd64.iso -m 1G -smp 2 -vnc :1 -device \
AC97,id=sound0,bus=pci.0,addr=0x4
then I get no sound. (I'd have expected that adding libvirt-qemu to the
audio group which owns /dev/snd/* would have sufficed, but it didn't.)
Note that I don't consider this bad. People run >1 VMs and wouldn't
want all to have sound. Note also that vnc does not - and never has -
forward sound, so if you are accessing the vm remotely, you'll get
video on the remote host, and audio on the kvm server.
A workaround would be to use spice, which does forward sound in addition
to improved video, and is available as of raring.
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https://bugs.launchpad.net/bugs/1246929
Title:
no audio in KVM virtual machines : cannot select alsa or pa
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