Here is a patched AppleHDA, but unfortunately no output volume control, both inputs have volume control.
btw. with Headphones the sound is very good.
Here is the kext (10.11.1) with working:
Headphone Rear (with amplifier)
Headphone Front (with amplifier)
S/PDIF-Out Rear (not tested)
Output volume control
If you don't use a dsdt and your audio device name @dsdt is HDEF you don't need any edits, else set layout-id to 0
If you use voodooHDA and AppleHDAdisabler, remove those kexts
For X99 chipsets (maybe others) you probably need Toleda's AppleHDAcontrollerpatch
AppleHDA.CA0132.kext.zip 1.61MB 395 downloads
I've made some progress, here a few test files:
for 5.1 sound try this 5.1 no volume control
for 5.1 orange rear jack instead of HP front AppleHDA.kext_orange_rear.zip 1.64MB 38 downloads
for volume control, only rear LineOut and rear HP AppleHDA.kext_2CH.zip
If you have bad sound quality try this one AppleHDA.kext_2CH_s_quali.zip
Here one with volume control, with output @ green rear, black rear, orange rear, and green HP rear
Another one with volume control, with working: front HP, instead rear orange jack
It seems, that the kexts from 10.11 doesn't work any longer @Sierra, so use this updated kexts:
If someone has found a data-sheet or similar for this codec, please share it, thanks
Some feedback would be usefull, thanks
Please don't add any patches that i've posted on this topic to your projects, when you ask people for donations, thank you.