Public bug reported:

Built-mic always capture sounds automatically about 20s later  when the  other 
audio stopped,
 And the sound from the built-mic would be turuned off if you start an audio 
configure tool OR just play an audio file. 
It's very strange that I have already set the MIC playback to MUTE in alsamixer.
It only happends on my built-mic , while the extra mic  NOT.

ProblemType: Bug
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  hangyu     2936 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfebfc000 irq 21'
   Mixer name   : 'Analog Devices AD1986A'
   Components   : 'HDA:11d41986,10431443,00100500 
HDA:15433155,10431335,00100700'
   Controls      : 39
   Simple ctrls  : 23
CheckboxSubmission: 4ab816b2afebfdc5ad32c076da499bdf
CheckboxSystem: b8f3ec504801f13fc208edb5c785b099
Date: Tue Nov 17 16:10:37 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: nvidia
Package: alsa-base 1.0.20+dfsg-1ubuntu5
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=zh_CN.UTF-8
 PATH=(custom, user)
 LANG=zh_CN.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
SourcePackage: alsa-driver
Uname: Linux 2.6.31-14-generic i686

** Affects: ubuntu
     Importance: Undecided
         Status: New


** Tags: apport-bug i386

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Built-mic always capture sounds automatically if no other audio being played
https://bugs.launchpad.net/bugs/484061
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