Plugging in External Monitor disables audio?

Discussion in 'OS X El Capitan (10.11)' started by victorhooi, Oct 23, 2015.

  1. victorhooi macrumors member

    Mar 29, 2011
    I'm running OSX 10.11.1 (15B42) on a 2015 rMBP 13".

    I have a Dell P2715Q monitor - I'm connecting this via a DisplayPort to Mini-DisplayPort cable to one of the Thunderbolt ports on the Macbook.

    My sound works fine normally.

    However, as soon as I plug in the monitor, OSX seems to disable the sound.

    If I try to adjust the volume, this is what I see:


    And of course, sound doesn't work in any apps (Chrome, Skype etc.).

    Any thoughts on what's going on, or how to fix it?

    Or how I can gather more diagnostics on what's happening? Could this be an OSX bug?
  2. Autistic Behaviour macrumors member

    Autistic Behaviour

    Sep 9, 2015
    you can choose which audio output to use by clicking the option key while clicking the sound icon in menubar
  3. victorhooi thread starter macrumors member

    Mar 29, 2011
    Aha, you're right - I just noticed that it defaulted to trying to push sound via the DisplayPort as well.

    The monitor has a 3.5mm audio out - so I'm guessing it's trying to go rMBP -> DP to Monitor -> 3.5mm out. Not sure it's the best default, but oh well =).

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