Re: just an observation about USB

[Gerd Hoffmann <kraxel@redhat.com>]

On Fr, 2015-10-16 at 11:48 -0400, Eric S. Johansson wrote:
> 
> On 10/16/2015 07:55 AM, Stefan Hajnoczi wrote:
> > QEMU can emulate PCI soundcards, including the Intel HD Audio codec 
> > cards (-device intel-hda or -soundhw hda might do the trick). Low 
> > latency and power consumption are usually at odds with each other. 
> > That's because real-time audio requires small buffers many times per 
> > second, so lots of interrupts and power consumption. Anyway, PCI 
> > should be an improvement from USB audio. Stefan 
> 
> I set it up with ich9.  I switched the default audio to my headset. I 
> hear the windows startup sound in the headset. Dragon reports that the 
> mic is not plugged in.  I can see the audio level move in the sound 
> settings so I know the host is hearing the audio
> 
> what should I look at next?

Try '-device intel-hda -device hda-micro' (instead of -device intel-hda
-device hda-duplex', or '-soundhw hda' which is a shortcut for the
latter).

'hda-duplex' presents a codec with line-in and line-out to the guest.
'hda-micro' presents a codec with microphone and speaker to the guest.
Other than having in and out tagged differently the codecs are
identical.  But especially declaring the input being a mic seems to be
needed to make some picky windows software happy.

cheers,
  Gerd