Installed Yosemite vanilla using chameleon on my rig...specs are in my signature I have tried installing VoodooHDA 2.8.2, unfortunately that didn't work. Then I tried patched appleHDA for alc665 from mackintosh Vietnam tool... didn't work.. I haven't find any DSDT patch for audio. Here's my System report for audio and IOReg. Am I missing something in DSDT or any kext or boot flag? EDIT 1: Tried http://www.insanelymac.com/forum/files/file/24-applehda-for-alc665/ PATCH It didnt work. EDIT 2 : Switched to Clover. Patched DSDT, Installed the kexts. Voila.. It worked Subwoofer aint working though but fix that soon. Thanks to @The_Village_Idiot, @apianti I will make a list of working/non working soon.