Re: [Qemu-devel] assigned EHCI USB headset not working

[malc]

On Thu, 9 Jun 2011, Jan Kiszka wrote:

> On 2011-06-09 09:08, Andr? Weidemann wrote:
> > Hi Jan,
> > 
> > On 09.06.2011 08:53, Jan Kiszka wrote:
> >> On 2011-06-09 08:19, Andr? Weidemann wrote:
> >>> Hi Gerd,
> >>>
> >>> On 08.06.2011 14:49, Gerd Hoffmann wrote:
> >>>> Hi,
> >>>>
> >>>>> The sound device shows up under Windows7 and drivers are installed
> >>>>> automatically. Unfortunately it does not work. All the players I
> >>>>> tried,
> >>>>> did not even start playing the sound file, although they detected the
> >>>>> DirectSound Device.
> >>>>
> >>>> iso xfer's from usb-linux via ehci are flaky for reasons not yet
> >>>> tracked
> >>>> down.
> >>>>
> >>>> Any reason why you don't just plug in a virtual sound card? The HDA
> >>>> emulation should work fine with win7.
> >>>
> >>> Using the hda driver was my first attempt. But the result was not very
> >>> convincing. When playing mp3s inside the VM, I could hear music coming
> >>> from the speakers, but the sound was very choppy and too slow. It was no
> >>> joy listening to it.
> >>
> >> Does "export QEMU_AUDIO_DAC_TRY_POLL=0" before invoking qemu helps? It
> >> depends on your host-side interface. Using ALSA here, it is generally
> >> required.
> >>
> >> Note that this discussion rather belongs on qemu-devel.
> > 
> > Thank you very much. Setting the variable did the trick.
> > Could this perhaps be included in the man page? I am sure there will be
> > others who will eventually run into the same problem as I did.
> 
> It is a long-standing issue of QEMU that I always wanted to understand
> but never found the time for. CC'ing malc, maybe he has a good idea how
> to finally attack this.
> 

Attack what exactly?

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