Comment 2 for bug 463178

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Luke Yelavich (themuso) wrote : Re: [Bug 463178] Re: Sound isn't working on MacBook 5,2

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