[vfio-users] Distorted sound in guest with Pulseaudio

[Will Marler]

Would you mind putting this information into the Arch wiki? I actually
bought a pair of USB headphones and pass them through to the guest directly
in lieu of figuring out PulseAudio over TCP.

On Fri, Aug 28, 2015 at 12:49 PM, Garrett Powell <
garretttracypowell at gmail.com> wrote:

> 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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>>
>
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