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

[tinyhitman]

I can reproduce this on Windows 10 (64bit) with hda device.

Host kernel is 4.1.13-rt15-1-rt, also tried with non-realtime kernel
with same results.

Output works without delay, given it is choppy from time to time.
Using the following env vars when starting QEMU:

QEMU_AUDIO_DRV: pa
QEMU_PA_SAMPLE: 32 # also tried with 128, 256, 512 and 1024. Same results for 
input, output got less choppy but with notable latency
QEMU_PA_SERVER: unix:/run/user/1000/pulse/native # where user with uid is the 
user with Xorg and PA session, of course.

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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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