Comment 11 for bug 139814

Wow finally got this working for my Asus F9s.

After all the different hacks - reverting to the current Alsa driver. 1.0.14-1ubuntu1
and editing /etc/modprobe.d/alsa-base and adding the line:

options snd-hda-intel model=lenovo

at the end of the file

Reboot and sound is working. Also make sure the headphone option is checked in your mixer. And PCM and Front is all the way up and unmuted.

Credit to french forum (note: lenovo is incorrectly written as lenevo):
http://forums.gentoo.org/viewtopic-t-579925.html?sid=65564bf2b5fe9285cbae03f0e324efa0