SPDIF Passthrough: Only Static on Mavericks (Gigabyte Z68X-UD3H-B3 - ALC 889)

[Weishauptus]

Hi Guys,

did anyone ever figure out how to get full 5.1 optical passthrough (SPDIF) for DTS and DD signals for the z68x-ud3h-b3 on mavericks? I get digital audio out, I use the layout id 1 (as far as I know that doesn't matter for SPDIF) and use the standard DSDT patching recommended by toleda. Using newest Multibeast with ALC 889 AppleHDA. S/L/E is clean from any other legacy kexts or injections, as is /E/E.

What happens when I try to play back DTS/DD Passthrough via XBMC (set up to passthrough of course) or MplayerX:
Some kind of white noise/static and no change in signal type as far as my receiver is concerned - still 2.0 audio.

This is my HDEF device:

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

                Method (_DSM, 4, NotSerialized)
                {
                    Store (Package (0x04)
                        {
                            "layout-id", 
                            Buffer (0x04)
                            {
                                0x01, 0x00, 0x00, 0x00
                            }, 

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

edit: all my forum research yielded was: buy an external usb audio interface and circumvent the issue.
maybe toleda or another kind experienced soul has any input? any logs I can add or tests I can conduct?

 

[toleda]

Some kind of white noise/static and no change in signal type as far as my receiver is concerned - still 2.0 audio.

Mavericks: Surround Sound [Guide]

 

[Weishauptus]

Thanks toleda. My configuration already adheres to this guide.

- latest multibeast for patched AppleHDA
- built-in digital output
- sound is routed as passthrough signal to receiver
- players used for testing are configured as per your guide (xbmc 13+ mplayerx 1.0.22+ vlc - all with ac3/dts spdif passthrough or corresponding option selected)
- audio in other OS works perfectly, including digital passthrough

- audio in osx works perfectly fine on 2 channels, only DD/DTS/AC3 are encoded incorrectly

 

[toleda]

- audio in osx works perfectly fine on 2 channels, only DD/DTS/AC3 are encoded incorrectly

- only on your system, no idea why.

 

[Weishauptus]

yeah it seems to be a motherboard specific issue (my other builds work just fine), thanks for the reply.