HDAAnalyzer and Linux 3.8.0-26-generic:
card-0/codec-0/data[2]  # 1 never plugged, 0 plug in headphones, 1 unplug 
headphones
card-0/codec-0/Node[0x0d]PIN  # OUT=1 never plugged, OUT=0 plug in headphones, 
OUT=1 unplug headphones

HDAAnalyzer and Linux 3.10.0-2-generic:
card-0/codec-0/data[2]  # 1 never plugged, 0 plug in headphones, 0 unplug 
headphones
card-0/codec-0/Node[0x0d]PIN  # OUT=1 never plugged, OUT=0 plug in headphones, 
OUT=0 unplug headphones
Using HDAAnalyzer to set card-0/codec-0/data[2]=1 and 
card-0/codec-0/Node[0x0d]PIN/OUT=1 fixes the internal speakers to play sound 
again.

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https://bugs.launchpad.net/bugs/1195377

Title:
  [Inspiron 1420, SigmaTel STAC9228, Speaker, Internal] fails after a
  while or plug in and out headphones

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https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1195377/+subscriptions

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