Files posted by Huckleberry Pie
Props to Oscar09 for the modified kext. This was made for the ASUS P5QL-PRO but it should also work on any board that uses the ALC888 chipset.
HDAEnabler also comes bundled with the kext (i.e. integrated, not as a separate kext folder), so that you don't even have to bother with DSDTs and stuff like that.
Tested on an Intel DG31PR.