do your computer chassis have the hda front audio panel with Jack
detection ?

ports:
                analog-output: Salida analógica (priority 9900, available: 
unknown)
                        properties:
                                
                analog-output-headphones: Auriculares analógicos (priority 
9000, available: unknown)
                        properties:
                                
        active port: <analog-output-headphones>


Simple mixer control 'Jack Detect',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [off]


http://git.kernel.org/?p=linux/kernel/git/tiwai/sound.git;a=commit;h=187d333edc0a8e1bb507900ce89853ffe3bd2c84

** Summary changed:

- [P4M900T-M2, VIA VT1708, Green Headphone Out, Front] No sound at all
+ [P4M900T-M2, VIA VT1708, Green Headphone Out, Front] hda-intel: spurious 
response and no sound at all

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https://bugs.launchpad.net/bugs/1106080

Title:
  [P4M900T-M2, VIA VT1708, Green Headphone Out, Front] hda-intel:
  spurious response and no sound at all

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