[vfio-users] Distorted sound in guest with Pulseaudio

[Garrett Powell]

Thanks for the quick reply. It took me a while, but I was able to get it
working based on your suggestion.
In case anyone else is having a similar issue:

I uncommented this line in /etc/pulse/default.pa.
#load-module module-native-protocol-tcp

I exported these three environment variables in my launch script.
QEMU_AUDIO_DRV=pa
QEMU_PA_SERVER=localhost
PULSE_SERVER=localhost

On Wed, Aug 26, 2015 at 1:57 PM ajs124 <redhat at ajs124.de> wrote:

> Hey,
>
> a workaround/hack I use for this is doing pulseaudio over TCP to localhost.
>
> I don't have the details of my setup with me at the moment, but iirc you
> have to export PULSE_SERVER and maybe enable the module, depending on your
> distro.
>
> There are tutorials out there for doing it over the LAN, you simply have
> to replace the server/client with localhost.
>
> On Wed, 26 Aug 2015 17:45:21 +0000
> Garrett Powell <garretttracypowell at gmail.com> wrote:
>
> > I can only hear sound in the guest (Windows 10) if there are no
> > applications running in the host that use pulseaudio (Skype, Tox, etc.).
> > Even then, the sound is incredibly distorted with a lot of static. I'm
> > using an external USB DAC. Here's my QEMU launch script:
> >
> > #!/bin/bash
> > synergys --daemon --config /etc/synergy.conf
> > export QEMU_AUDIO_DRV=pa
> > qemu-system-x86_64 \
> > -enable-kvm \
> > -m 10240 \
> > -cpu host,kvm=off \
> > -smp sockets=1,cores=4,threads=2 \
> > -vga none \
> > -nographic \
> > -soundhw hda \
> > -name Windows10-VM \
> > -drive
> >
> if=pflash,format=raw,readonly,file=/usr/share/edk2.git/ovmf-x64/OVMF_CODE-pure-efi.fd
> > \
> > -drive
> >
> if=pflash,format=raw,file=/usr/share/edk2.git/ovmf-x64/OVMF_VARS-pure-efi.fd
> > \
> > -device vfio-pci,host=03:00.0 \
> > -device vfio-pci,host=03:00.1 \
> > -device virtio-scsi-pci,id=scsi \
> > -drive
> > file=/home/garrett/VMs/Windows10/windows.img,id=disk,format=raw,if=none
> > -device scsi-hd,drive=disk \
> > -drive file=/home/garrett/VMs/Windows10/windows.iso,id=isocd,if=none
> > -device scsi-cd,drive=isocd \
> > -drive
> file=/home/garrett/VMs/Windows10/virtio-win.iso,id=virtiocd,if=none
> > -device ide-cd,bus=ide.1,drive=virtiocd \
> > -drive file=/mnt/storage/win-storage.img,id=storage,format=raw,if=none
> > -device scsi-hd,drive=storage \
> > -boot menu=on
> > pkill synergys
> >
> > This is some of the output I get whenever I run the script:
> >
> > pulseaudio: pa_context_connect() failed
> > pulseaudio: Reason: Connection refused
> > pulseaudio: Failed to initialize PA contextaudio: Could not init `pa'
> audio
> > driver
> > ALSA lib pcm_dsnoop.c:614:(snd_pcm_dsnoop_open) unable to open slave
> > alsa: Could not initialize ADC
> > alsa: Failed to open `default':
> > alsa: Reason: No such file or directory
> >
> > Thinking that running the script as root might be the source of the
> issue,
> > I tried running pulseaudio in system-wide daemon mode. Audio in the host
> > still works, and I'm getting the same distortion in the guest. This is
> some
> > of the output I get now:
> >
> > pulseaudio: Wrong context state
> > pulseaudio: Reason: Access denied
> > pulseaudio: Failed to initialize PA contextaudio: Could not init `pa'
> audio
> > driver
> > ALSA lib pcm_dsnoop.c:614:(snd_pcm_dsnoop_open) unable to open slave
> > alsa: Could not initialize ADC
> > alsa: Failed to open `default':
> > alsa: Reason: No such file or directory
> >
> > I've tried setting QEMU_AUDIO_DRV=alsa and I get the same results/output
> > minus the pulseaudio stuff. I'm clueless at this point.
> >
> > Thanks,
> > Garrett
>
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