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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