Say you have your master audio output device set to "Monitor 2" (a DP monitor) and you have an app with it's own selectable audio output set to "USB Speaker", which allows volume control from the Mac's UI.
Here's the complication and how you do it, that works today with Catalina and I think also worked with later versions of High Sierra. Perhaps this was fixed in the last two years or perhaps I was wrong when I wrote the question and comments. This is contrary to what I said in this question and contrary to my comments to the Accepted Answer. If an App allows you to select its output device, and you select one that allows volume control, you CAN control it even when a DP or HDMI monitor is connected. At that location the volume controls remain active and they control the internal speaker in the laptop as they should. In another location I use the same cable to plug in to Dell monitors with Displayport but without built in speakers in the monitors. Using a Thunderbolt to Displayport cable, plugging in to a Dell monitor with speakers. Some additional info: It's a Macbook Pro 13" 2018 version. Is there no way to control the volume of an app when an external speaker is connected even if the app is not using the external speaker? Is Apple assuming that if I have external speakers I am so much better using their own volume control that I have to be forced to do it? That is annoying because the monitor's volume controls are buried in terrible menus accessed by terrible buttons on the back of the monitor.Īlso, if I am inside an app where I can select the audio device and I select the Mac's internal speakers, the volume controls are STILL disabled. Tip: To quickly move windows or apps from one screen to another, on your keyboard, press Search + Alt + m or Launcher + Alt + m.When I plug my Mac into a DisplayPort monitor that has loudspeakers, the Mac's volume controls become disabled.
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