Working on:

• Gigabyte GA-P43T-ES3G
• ASUS P8P67 GA Rev 3.0
  
• Elite Group ECS H55H-I
  
• Asrock Z68 PRO-M
  
  
• Gigabyte P55-UD3L Rev 2.3
  
  
• ASRock extreme4 P67

Mute working!

UPDATE: If you can't use DSDT edit, try the HDAEnabler892.kext!

Requires DSDT mod:

Code:

Device (HDEF)            
{
                Name (_ADR, 0x001B0000)
                Method (_PRW, 0, NotSerialized)
                {
                    Return (Package (0x02)
                    {
                        0x0D, 
                        0x05
                    })
                }


                Method (_DSM, 4, NotSerialized)
                {
                    Store (Package (0x08)
                        {
                            "codec-id", 
                            Buffer (0x04)
                            {
                                0x92, 0x08, 0xEC, 0x10
                            }, 


                            "layout-id", 
                            Buffer (0x04)
                            {
                                0x7C, 0x03, 0x00, 0x00
                            }, 


                            "device-type", 
                            Buffer (0x0F)
                            {
                                "Realtek ALC892"
                            }, 


                            "PinConfigurations", 
                            Buffer (One)
                            {
                                0x00
                            }
                        }, Local0)
                    DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
                    Return (Local0)
                }
            }