Try this. Open /etc/modprobe.d/alsa-base.conf in an editor, and at the
end of this line:
options snd-hda-intel power_save=10 power_save_controller=N
Add "model=mb5" like this:
options snd-hda-intel power_save=10 power_save_controller=N model=mb5
Then reboot, and let me know whether you get sound.
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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