Comment 94 for bug 576601

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Fajran Iman Rusadi (fajran) wrote :

I managed to get the sound working by following instruction for MBP5,5/Lucid here https://help.ubuntu.com/community/MacBookPro5-5/Lucid#Sound

Basically I added the following to /etc/modprobe.d/alsa-base.conf and restart

options snd-hda-intel model=mbp55

also make sure the front speaker is not muted