Could you please add the following line to /etc/modprobe.d/alsa-
base.conf
options snd-hda-intel model=mb5
Once added, save the file, and reboot. Please report back as to whether
you have sound working after the reboot.
Thanks
affects ubuntu/alsa-driver
status incomplete
** Changed in: alsa-driver (Ubuntu)
Status: New => Incomplete
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Sound isn't working on MacBook 5,2
https://bugs.launchpad.net/bugs/463178
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