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I'm on OSX 10.9.2 using a Samsung SA850 Display connected to the display port of my MBP 15" Late 2012 Model.

All seems fine, but there is a problem with audio. Generally, whenever the display goes to sleep and wakes up again, my audio stops working. I found out that this is because the display has an integrated audio device, so for some reason this seems to mess with my system settings. I have no idea why.

This is kind of a clueless approach, but perhaps anyone knows how I can just totally stop OSX from even considering my display as an audio output device?

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@CummanderCheckov did you find a solution? – codecowboy Aug 21 '14 at 13:30
Do you have an Nvidia GPU? I know a fix for that. – Daniel Hickman Nov 29 '14 at 21:29
See if the display port shows up in Sound properties "playback" tab, if it does, disable any display port entries in there. – Moab Dec 28 '14 at 20:47

Make the sound icon visible in the menu bar (at the bottom of the Sound system preferences window), then hold Alt ⌥ and click it to view all possible outputs. Sometimes the actual Output window in system preferences doesn't actually display all available options.

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I suppose you could turn the sound off on your monitor using the buttons. You could also just use a connector like vga or dvi to get rid of sound output.

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I havn't had a Mac for quite a while now, but I'm pretty sure you can't. I think somehow it must be possible to deactivate the proper kernel device that's responsible for sound over HDMI/DisplayPort but it's hard to say how easy this can be accomplished, how that will corrupt functionality or how easy it will be to reverse. Someone should confirm this but I think you could get a cheap usb sound card, which would allow you to completely ignore the internal soundcard, thus only showing you devices connected to the usb card. Or maybe a software solution, something like AudioMate for example could do the trick.


But I would suggest you do the following: It's kind of a strange solution but it'll work and pretty much everyone has the know-how to do it.

  1. Take a look at the pin assignments of DisplayPort
  2. Get yourself a spare DisplayPort cable
  3. Cut it in the middle and solder all the pins back together, avoiding the pins connecting audio. (These should be pin 15-17)
  4. Use the cable to connect your display
  5. Be happy!

    Pin 1   ML_Lane 0 (p)   Lane 0 (positive)   
    Pin 2   GND Ground  
    Pin 3   ML_Lane 0 (n)   Lane 0 (negative)   
    Pin 4   ML_Lane 1 (p)   Lane 1 (positive)   
    Pin 5   GND Ground  
    Pin 6   ML_Lane 1 (n)   Lane 1 (negative)   
    Pin 7   ML_Lane 2 (p)   Lane 2 (positive)   
    Pin 8   GND Ground  
    Pin 9   ML_Lane 2 (n)   Lane 2 (negative)   
    Pin 10  ML_Lane 3 (p)   Lane 3 (positive)   
    Pin 11  GND Ground  
    Pin 12  ML_Lane 3 (n)   Lane 3 (negative)   
    Pin 13  CONFIG1 connected to Ground1)   
    Pin 14  CONFIG2 connected to Ground1)   
    Pin 15  AUX CH (p)  Auxiliary Channel (positive)    
    Pin 16  GND Ground  
    Pin 17  AUX CH (n)  Auxiliary Channel (negative)    
    Pin 18  Hot Plug    Hot Plug Detect 
    Pin 19  Return  Return for Power    
    Pin 20  DP_PWR  Power for connector (3.3 V 500 mA)
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I like your thinking, but audio in DisplayPort (and HDMI) travels over the main link, not the aux channel. :( – joerick Apr 28 at 18:41
I made a note in ma answer @joerick – farosch Apr 29 at 13:47

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