[Spice-devel] [PATCH] Manual: add info about QEMU_AUDIO_DRV

[Victor Toso]

Hi,

On Tue, Nov 29, 2016 at 11:10:40PM +0200, Uri Lublin wrote:
> On 11/29/2016 06:54 PM, Jonathon Jongsma wrote:
> > hramrach on IRC had an issue with audio not working. He was using
> > suse and his qemu defaulted to using the pulseaudio audio driver instead
> > of spice.  Explicitly setting the audio driver to spice using the
> > QEMU_AUDIO_DRV environment variable solved the problem. Add this tip to
> > the manual for others having the same issue in the future.
> > ---
> >  docs/manual/manual.txt | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/docs/manual/manual.txt b/docs/manual/manual.txt
> > index 9d394b6..3b097ba 100644
> > --- a/docs/manual/manual.txt
> > +++ b/docs/manual/manual.txt
> > @@ -257,6 +257,13 @@ communication with the client. The Spice option `disable-ticketing` is
> >  specifying that ticketing (simple authentication method) is not
> >  used. The virtio and chardev devices are required by the guest agent.
> >
> > +The `-soundhw ac97` option provides a sound device for the guest to use for
>
> Hi Jonathon,
>
> I think for VMs with newer Operating Systems (not sure which ones)
> it's better to use '-soundhw hda' (Intel HD Audio).
>
> Looks good otherwise.

AFAIK, Intel HD Audio is always preferred unless you are on Windows 7 as
we have a long standing bug in QEMU that makes a small sound artifact
very often, you can find more about it at [0]

[0] https://bugzilla.redhat.com/show_bug.cgi?id=1203507#c23

QEMU_AUDIO_DRV is also interesting to debug audio issues. By setting
QEMU_AUDIO_DRV=pa for instance it will redirect the audio to the host's
PulseAudio.

>
> Uri.
>
> > +audio playback and recording. In order for spice audio to work to properly,

Not sure but I think the second 'to' is extra in 'audio to work to'

> > +qemu must use the 'spice' audio driver. Depending on how qemu was built,
> > +however, this might not be the default audio driver. To ensure qemu uses the
> > +spice audio driver, you can set the environment variable
> > +`QEMU_AUDIO_DRV=spice`.
> > +
> >  Basic configuration
> >  -------------------

My comments above were just to share some tips on this. Beside the
second 'to', looks good to me too!

Acked-by: Victor Toso <victortoso at redhat.com>
>
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