Hey, I have AD1988b in my motherboard P5K-E Wifi/AP. I got the audio kext (AppleHDA.kext) from PCWiz's OSx86Tools (detecting the hardwares and then download some kexts).

It is good to have that auto-switch, so we don't have to change it in "System Preferences..." after connecting/disconnecting the headphone.

Alternatively (If there are no kexts), teach us how to modify them.

Thanks.