Not Working:
Sub-Woofer port – using voodooHDA – I have found posts regarding ALC668, but could not get it working on my system. I will research this further as I would rather use AppleHDA if I could.
NVidia GTX 850M – Disabled
HDMI Audio
Card reader: Realtek RTS5139
Not Tested:
DP port
USB 3.0
I hope other owners of this system are successful and help with items that are not working. I know that it will never be 100%, but as of now my system is useable for me. Good luck, and if you have problems drop me a post. I will check the site often to see if anyone needs help.