Display port audio not working

Discussion in 'macOS' started by gianthobbit, Dec 5, 2012.

  1. gianthobbit macrumors 6502

    Apr 20, 2010
    I just hooked up my new Dell u2713hm monitor and using mini display port to display port for hook up.

    It shows an audio source:

    As you can see as well, it says it has no input controls and if I hit the volume the HUD comes up but with the mute symbol.

    Did some google searching to no avail. Any suggestions?
  2. justperry macrumors G3


    Aug 10, 2007
    In the core of a black hole.
    Just a hunch, did you try to do a restart, normally you should not have to but give it a try.
    I've seen it on my Mac but only after fiddling with some extensions.
  3. gianthobbit thread starter macrumors 6502

    Apr 20, 2010
    Just did a restart, no bones.
  4. BluePhilG macrumors member

    Oct 29, 2010
    Did you get a resolution on this? I have the same problem....
  5. gianthobbit thread starter macrumors 6502

    Apr 20, 2010
  6. ScoobyMcDoo macrumors 65816

    Nov 26, 2007
    Austin, TX
    You never said what mac you have. I think the MPB6,1 was the first that had sound wired to the display port. I have no idea about iMacs.
  7. BluePhilG macrumors member

    Oct 29, 2010
  8. gianthobbit thread starter macrumors 6502

    Apr 20, 2010
  9. wills11 macrumors member

    Nov 4, 2013
    same issue—solved!

    I have a mid-2013 MPRr and am using a Startech mDP-DP cable as well as the USB cable to the monitor (no idea if this makes any difference). I had the same experience as you—my sound settings screen looks the same as yours and after reading your post I was disheartened. But I read elsewhere that the audio should be carried through the mDP cable, and so I went back to the settings and clicked on the left speaker image, then the right speaker, and it worked!

    I cannot control the volume with the keyboard—that's what the knob on the Dell sound bar is for.

    PS: I'm assuming you're using the Dell accessory sound bar, since that audio port isn't supposed to be used for anything else, apparently. If you're not using it, I picked one up for $15 on eBay; it's part number AX510. Because I found one for less, I bought the AX510PA which is exactly the same but has a power adapter included (that's not needed with the u2713hm).

    Hope this helps!
  10. bayxsonic macrumors newbie

    Feb 19, 2011
    Old post but someone might benefit from the solution: so far there are not "solutions" but only a workaround: Soundflower or Syphon

    I'm using Syphon on Yosemite because I read that Soundflower is distorting sound on it, but I'm not completely happy either:

    • the volume scales strangely (100% volume is not much higher than 50%)
    • sometimes I have to re-set Syphon after sleep or else I won't hear anything
    • if I unplug my monitor, OS X won't redirect the audio to its internal speakers
  11. BluePhilG macrumors member

    Oct 29, 2010

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10 December 5, 2012