try hda-jack-sense-test to verify the nodes of front panel jacks and
rear panel jacks by plug and unplug the Mic jacks and line in jack


it is unlikely node 0x15 is the front Mic jack since pincap does not support 
DETECT

Node 0x15 [Pin Complex] wcaps 0x400001: Stereo
  Control: name="Front Mic Phantom Jack", index=0, device=0
  Pincap 0x00000020: IN
  Pin Default 0x9033012e: [Fixed] CD at Int N/A
    Conn = ATAPI, Color = Unknown
    DefAssociation = 0x2, Sequence = 0xe
    Misc = NO_PRESENCE
  Pin-ctls: 0x20: IN

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https://bugs.launchpad.net/bugs/1185497

Title:
  [PI945GCM, SigmaTel STAC9221 A2, Green Headphone Out, Front] No sound
  at all

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