I can plug headphones into the headphone jack, run alsamixer and see that I've just got 00 instead of M meaning the headphone jack is not muted. But no sound comes out.
Try this command:
sudo sh -c "echo 'options snd-hda-intel model=mbp55' >> /etc/modprobe.d/alsa-base.conf"
from the Ubuntu Documentation
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3 years ago