did availability of analog-output-headphone change to yes when you
plugged the headphone ?

pactl list sinks

ports:
                analog-output-speaker: Haut-parleurs (priority 10000, latency 
offset 0 usec, available: unknown)
                        properties:
                                device.icon_name = "audio-speakers"
                analog-output-headphones: Casques analogiques (priority 9000, 
latency offset 0 usec, available: no)
                        properties:
                                device.icon_name = "audio-headphones"


http://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/plain/Documentation/sound/alsa
/HD-Audio.txt

study the following section and try hda-analyzer to toggle gpio

Speaker and Headphone Output
~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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https://bugs.launchpad.net/bugs/1181828

Title:
  macbook air 2,1 no sound

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