Acer eMachines eM350  
Machine 00:1b.0 0403: 8086:27d8 (rev 02)
        Subsystem: 1025:0349
Codec: Realtek ALC272X
Vendor Id: 0x10ec0272
Subsystem Id: 0x10250349
Revision Id: 0x100001

essentially bug#639846 (first raised for 10.04, but still present in
12.04

Note: I confirmed this bug by recording direct from hardware 
   pasuspender arecord -Dhw:0 -fcd -d5 mic.wav
Then view waveform in Audacity to confirm that one channel is inverted version 
of the other

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https://bugs.launchpad.net/bugs/1002978

Title:
  [meta-bug] Inverted Internal microphone (phase inversion)

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