Re: [libvirt] guests and pulseaudio fighting over audio devices

On Tue, Sep 15, 2009 at 04:45:31PM -0400, Dave Allan wrote: > I noticed that when a KVM guest created with virt-manager is running on > F10, sound on the physical host stops working. When all VMs are > shutdown, sound starts working again. Removing the <sound> tag from the > VM XML allows sound to work while the VM is booted. To further > complicate troubleshooting, if audio is already playing when the guest > is started it keeps playing, since pulse already has the device open. > > The message in /var/log/messages when I try to play audio is: > > pulseaudio[6492]: module-alsa-sink.c: Error opening PCM device front:0: > Device or resource busy > > strace of pulseaudio shows: > > open("/dev/snd/pcmC0D0p", O_RDWR|O_NONBLOCK) = -1 EBUSY (Device or > resource busy) > > but fuser and lsof show nothing. A trivial test program also sees > Device or resource busy when trying to open /dev/snd/pcmC0D0p > > I am in favor of removing the <sound> tag from the default > configuration, since I don't use sound from within guests and I do use > sound on my desktop, but perhaps this behavior is specific to my > configuration. I haven't investigated it exhaustively. What does > everybody else think? It is complicated :-) In Fedora >= 11 we currently disable all use of sound cards, but this upsets people who want sound ;-P I'm working on a new version of the patch which sets up audio-over-VNC, while for SDL allows the host audio backend to be used & configured. I still need to finish my GTK-VNC patches to do the client end of audio over VNC, then it'll all play correctly with desktop audio services via gstreamer/pulseaudio