50

I'm on OS X v10.9.2 (Mavericks) using a Samsung SA850 Display connected to the display port of my MacBook Pro 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 how can I just totally stop OS X from even considering my display as an audio output device?

Peter Mortensen
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SQRCAT
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8 Answers8

7

There is the same problem with macOS v10.12 (Sierra) and a Dell P2715Q, here. It seems like a display without any audio shouldn't trigger this, but ¯\(ツ)/¯

With the display connected and no headphones, I used the Sound preferences to change the output to Internal Speakers. Now, at least for this user, the MacBook understands that I never want the sound output routed to DisplayPort.

Peter Mortensen
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gerwitz
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6

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.

Greg Dubicki
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jmabs
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3

Plug an AUX cable into the monitors audio output without the other end of the cable plugged into anything. You have to leave it dangling there at all times, but it will solve this problem.

This has also solved the related problem of my Bluetooth headphones staying connected, but no longer playing audio every time I connected to my monitor.

Peter Mortensen
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Sokushinbutsu
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3

Unloading the com.apple.driver.AppleGFXHDA kernel extension caused the DisplayPort audio drivers to be removed immediately.

sudo kextunload -b com.apple.driver.AppleGFXHDA

You will need to persist this across reboots.

Peter Mortensen
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Jeremy
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2

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 the sound output.

Peter Mortensen
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Liamrberney
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0

macOS v10.15.1 (Catalina) with a 2018 MacBook Air.

I just found an application that might fix this problem. I was having the same issue with my Dell P2715 monitor when using video conference applications like Skype and Zoom.

The name of the application is "Audio Profile Manager" by Septimal Mind Limited. It is only USD4, but these are things Apple should have solved it by including such function as an option...

Peter Mortensen
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Dr.DO
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-1

Even though I have never chosen to hear the awful sound output on my AOC monitor, macOS stubbornly switches at full volume each time I plug in the monitor. Here you can see I am trying to disable it by creating an aggregate device, but after doing this I end up with no volume controls and at 100% volume. So I can't say this works, and consider hacking my HDMI cable open.

enter image description here

Tomachi
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-3

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.

UPDATE: NOT WORKING. SEE COMMENT BELOW

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)
farosch
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