Here is how I got mine working, not sure if its going to work for
you, might give it a try, also I never had much luck with surround
sound on Realtek, not even using Windows


(1) Find and download "Taruga’s AppleHDA Patcher version 1.20"
(2) Find and download "VoodooHDA.kext"
(3) Make your own CODEC Dump in Linux buy typing this into the Terminal

"cat /proc/asound/card0/codec#0 > ~/Desktop/codec_dump.txt"

and use that file,

if you get nothing, try changing "codec#0" to "codec#1"
keep going up in numbers till you get the info.

Like

"cat /proc/asound/card0/codec#0 > ~/Desktop/codec_dump.txt"
"cat /proc/asound/card0/codec#1 > ~/Desktop/codec_dump.txt"
"cat /proc/asound/card0/codec#2 > ~/Desktop/codec_dump.txt"

(Hint) the Ubuntu Install CD works just fine for this

(4) Find and download "Kext Utility"
(5) Drag "VoodooHDA.kext" onto "Kext Utility" to install
(6) Make a backup copy of "AppleHDA.kext", its in "/System/Library/Extensions"
(7) Drag "codec_dump.txt" onto "AppleHDA Patcher" to install