Comment 32 for bug 346170

I did a fresh install of MM 10.10 beta. To get sound working, you just have to go to /etc/modprobe.d/alsa-base.conf and add the line snd-hda-intel model=imac91.

Then in terminal enter "alsamixer", and max out the volume on each bar. Then in sound preferences, go to the hardware tab and choose the "analog stero output option."

Sound will work perfectly and the tinny quality is gone. The speakers finally sound how they should. It's definitely not working straight out of the box.