Edit: The following guide is for getting ALC882 sound out working. The process may work with any ALC8xx chipset with a few changes. See the Appendix at the end of the guide for how to make those changes.

The Guide

I have yet to see the definitive guide here on getting ALC882 sound working. The best one I've seen comes from aRt on another forum and this is it (with some modifications):

How to get HD audio working - sound for ya!!!

1) Backup AppleHDA.kext:

In Terminal, type:

CODE

cd /System/Library/Extensions
sudo mkdir audio_backup
sudo mv AppleHDA.kext audio_backup/

2) Edit AppleAzaliaAudio.kext:

In Terminal, type:

CODE

cd /System/Library/Extensions
sudo pico AppleAzaliaAudio.kext/Contents/Info.plist

Search for IOHDAudioCodecVendorID (press Ctrl + W)

Find:

<key>IOHDAudioCodecVendorID</key>
<string>0x10ec0880</string>

Change <string>0x10ec0880</string> -- to -- <string>0x10ec0882</string>

Exit pico: press Ctrl + O to save and then Ctrl + X to exit

In Terminal, type:

CODE

sudo pico AppleAzaliaAudio.kext/Contents/PlugIns/AppleAzaliaController.kext/Contents/Info.plist

Search for IOPCIPrimaryMatch (press Ctrl + W)

Find:

<key>IOPCIPrimaryMatch</key>
<string>0xNNNN8086</string> (where NNNN are any 4 characters)

Change <string>0xNNNN8086</string> -- to -- <string>0x27d88086</string>
(note: for ALC882, the string is probably correct without any edit)

Exit pico: press Ctrl + O to save and then Ctrl + X to exit

3) Clean up the system:

In Terminal, type:

CODE

sudo diskutil repairpermissions /
sudo chown -R root:wheel AppleAzaliaAudio.kext
sudo chmod -R 755 AppleAzaliaAudio.kext
cd /System/Library
sudo rm -rf Extensions.mkext Extensions.kextcache

4) Then, reboot and enjoy sound out of two channels.


Appendix

The following information might help you get your ALC8xx sound out working. The strings that are replaced in the guide above are for Realtek ALC882 only. For other versions of ALC8xx sound or if you are having trouble getting ALC882 sound working, we need to determine the vendor and device ids of the audio device and the audio hub. There are no guarantees that this will get your sound working, but I am pretty sure this also works for ALC880, ALC888, ALC861 and maybe others.

To do this, go into Windows, then go to Device Manager:

Step A. Under "Sound, video and game controllers", select "Realtek High Definition Audio". Get Properties and then click on the Detail tab. Record the vendor and device ids.

As an example, in this picture, the set of id's are vendor = "10EC" and device = "0882"
 audio.jpg ( 58.54K ) Number of downloads: 12630


Step B. Under "System devices", find "Microsoft UAA Bus Driver For High Definition Audio" and also get the vendor and device ids.

In this picture, the set of id's are vendor = "8086" and device = "27D8"
 audio2.jpg ( 70.46K ) Number of downloads: 8537


Now, using The Guide above, substitute the following:

Instead of the string "0x10ec0882", use a new string constructed from the vendor id and device id from Step A. above.
It should be of the form 0x + (vendor id) + (device id). Like: 0x + 10ec + 0882 = 0x10ec0882

Instead of the string "0x27d88086", use a string constructed from the vendor id and device id from Step B. above.
However, it should be of the form 0x + (device id) + (vendor id).
Note that this is backwards from the previous string.