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I have a fresh ubuntu on iMac. I have managed to set up the sound from the native speakers, however, there is still no sound from the headphones. I have disabled automute in alsamixer, but this didn't help. Does anyone know what to do in this case?

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up vote 0 down vote accepted

The solution was found by adding a row of options snd-hda-intel model=imac27_122 to /etc/modprobe.d/alsa-base.conf as explained here.

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