here is a work around . it fixed my issue
wget http://www.cisgendered.com/~keyvin/mic-fix.deb
sudo dpkg -i mic-fix.deb
sudo shutdown -r now

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https://bugs.launchpad.net/bugs/1093395

Title:
  [12.04 64-bit] Acer C7 microphone input can't be captured by
  applications

Status in “alsa-driver” package in Ubuntu:
  Confirmed

Bug description:
  Installed ChrUbuntu on the new Acer C7 Chromebook using the
  instructions here: http://chromeos-
  cr48.blogspot.com/2012/04/chrubuntu-1204-now-with-double-bits.html

  A commenter at http://chromeos-cr48.blogspot.com/2012/11/looking-for-
  acer-c7-chrubuntu-tester.html has described the problem as follows:

  "The only issue I have identified and isolated is an ALSA bug with
  internal microphone support. The internal mic is digital, and can
  successfully amplify and play through the laptop speakers in realtime.
  Setup requires typing 'alsamixer' at the command line, F5 to see all
  the inputs and outputs, use spacebar at Digital Capture to toggle it
  on and off, mute the analogue mic and turn up the digital inputs and
  digital boost at the far right. However, this mic input cannot be
  captured by any application because ALSA only feeds the analogue mic
  input to applications, which results in loud static. To make sure this
  was an ALSA bug, I uninstalled PulseAudio, but it still was present.
  Not sure where to go from here, and hoping the ALSA developers already
  are aware and working it. By the way, both ALSA Mixer and the
  PulseAudio speaker volume control and mute at the upper right of the
  Umbutu Desktop must have volume up and be unmuted."

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