THX

Hi there. Same problem, almost. I'm running ML 12A269 with default (native) AppleHDA and this HDEF section in dsdt:

			Device (HDEF)
			{
				Name (_ADR, 0x001B0000)
				Method (_PRW, 0, NotSerialized)
				{
					Return (Package (0x02)
					{
						0x0D,
						0x05
					})
				}
				Method (_DSM, 4, NotSerialized)
				{
					Store (Package ()
						{
							"codec-id",
							Buffer (0x04)
							{
								0x89, 0x08, 0xEC, 0x10
							},
							"hda-gfx",
							Buffer (0x0A)
							{
								"onboard-1"
							},
							"layout-id",
							Unicode ("B"),
							"device-type",
							Buffer (0x10)
							{
								"Realtek ALC889a"
							},
							"PinConfigurations",
							Buffer (One)
							{
								0x00
							}
						}, Local0)
					DTGP (Arg0, Arg1, Arg2, Arg3, RefOf (Local0))
					Return (Local0)
				}
			}

Sound works, but I get a bunch of sound assertion errors in logs:

7/12/12 9:19:09.000 PM kernel[0]: Sound assertion in AppleHDADriver at line 1746
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDAWidget at line 4142
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDACodecGeneric at line 1207
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDAWidget at line 4142
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDACodecGeneric at line 1207
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDAWidget at line 4142
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDACodecGeneric at line 1207
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDAWidget at line 4142
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDACodecGeneric at line 1207
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDAWidget at line 4142
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDACodecGeneric at line 1207
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDAWidget at line 4142
7/12/12 9:19:10.000 PM kernel[0]: Sound assertion in AppleHDACodecGeneric at line 1207

Any suggestions how to fix it?