On 2011-06-09 17:13, malc wrote: > 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? Sound output over (at least) ALSA is not smoothly working in polled mode. It's similar to [1], which is yet unsolved. Jan [1] http://thread.gmane.org/gmane.comp.emulators.qemu/52365 -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
