[Qemu-devel] [Bug 1492649] Re: QEMU soundhw HDA huge microphone lag

[Jonathan Rubenstein]

I've got this issue too on windows 10 with QEMU emulator version 3.1.0
(Debian 1:3.1+dfsg-4). It seems to only occur when the device isn't used
in the windows host for a while by any application. If an application
opens the capture device, the delay slowly gets smaller until it's only
a 4th of a second.

My uneducated guess is that the pa/hda driver isn't dequeuing the buffer
unless the device is opened and being used by an application. This
should not be happening, it should move the read pointer to the sample
length even if the device isn't being used.

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https://bugs.launchpad.net/bugs/1492649

Title:
  QEMU soundhw HDA huge microphone lag

Status in QEMU:
  New

Bug description:
  I use a Windows 7 x86_64 guest with VGA passthrough and -soundhw hda.
  The audio plays fine, but the microphone input is delayed by more than
  20 seconds.

  -soundhw ac97 does not have this delay but it has choppy sound
  playback and input.

  System:
  Arch linux
  Kernel: 4.1.6-1-ARCH
  Audio hardware: 00:1b.0 Audio device: Intel Corporation 82801JI (ICH10 
Family) HD Audio Controller
  Audio system: Pulseaudio 6.0

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