Public bug reported:

Linux  3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686 
i386 GNU/Linux
Distributor ID: Ubuntu
Description:    Ubuntu 11.10
Release:        11.10
Codename:       oneiric
00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio 
Controller (rev 02)
HDA Intel ALC269

By default applications cannot listen to audio input from the laptop
mic.  There are two workarounds for this.

Either) Uninstall pulseaudio
Or) Open Pavucontrol and set the right mic to a lower volume than that of the 
left mic. In my case left is on 100% and right on 95%

This exact same issue is experienced by many other users with the same
hardware.

Some other cases:
http://www.jpierre.com/2009/04/fixing-mic-audio-problem-with-eee-pc-1000h-and-ubuntu-netbook-remix/
Note: The original blog post mentions the person removing pulseaudio 
http://askubuntu.com/questions/16980/eeepc-internal-microphone-not-working
Note: The top answer states to use different volumes
http://ubuntuforums.org/showthread.php?p=10136037
Note post #6 suggests different volume.

This bug has been around for a long while now in many Ubuntu releases.

** Affects: pulseaudio (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- Dual mic system does not work unless both mics have a different volume
+ Dual mic system does not work unless both mics have a different volume ALC269 
Intel HDA

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https://bugs.launchpad.net/bugs/894402

Title:
  Dual mic system does not work unless both mics have a different volume
  ALC269 Intel HDA

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