AppleHDA 2.1.7f9 Patched for ALC662
I made this for Gigabyte GA-G31M-S2L, but maybe works on other motherboards too.
You will get:

• Speakers, Headphone, LineIn, Mic (only the rear connector working), SPDIF (not tested)
• Speakers/Headphone autoswitch function
• Mute

You need DSDT edit:

Code:

Device (HDEF)
            {
                Name (_ADR, 0x001B0000)
                Method (_PRW, 0, NotSerialized)
                {
                    Return (Package (0x02)
                    {
                        0x09, 
                        0x05
                    })
                }
                Method (_DSM, 4, NotSerialized)
                {
                    Store (Package (0x08)
                        {
                            "codec-id", 
                            Buffer (0x04)
                            {
                                0x62, 0x06, 0xEC, 0x10
                            }, 
                            "layout-id", 
                            Buffer (0x04)
                            {
                                0x96, 0x02, 0x00, 0x00
                            }, 
                            "built-in", 
                            Buffer (One)
                            {
                                0x01
                            }, 
                            "PinConfigurations", 
                            Buffer (Zero) {}
                        }, Local0)
                    DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
                    Return (Local0)
                }
            }

No need for any enabler kext.
FIX PERMISSIONS after install!