Mac os x detect displays command line

macOS: Finding the Hidden Advanced Display Preferences - The Mac Observer

Drag the patch file from your desktop into the Terminal window and press Return on your keyboard. You will be prompted to enter your administrator password. Do this and press Return on your keyboard. Be sure that you monitor supports DisplayPort 1. Needless to say, this display just got a lot more awesome thanks to this setup. And, of course, special thanks to Floris Fredrikze, aka Floris for creating such an awesome patch. The Mac runs macOS for its operating system.

Apple Mac OS X Multiple Monitor Trick

A collection of tutorials from the 9to5Mac team helping you fix and get the most out of your Mac and iOS devices. Then, open System Preferences and go to Mission Control.

Release 5.6 (Build 190617)

Once selected, pull down the menu next to it and choose Put Display To Sleep. Connect the external display to your MacBook and then move your mouse to the corner you selected above.


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It should turn off only the internal display. Close your MacBook lid and wait a couple of seconds. Lift the lid and it should stay off.


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  • You can use the trackpad and keyboard in this way as well. That said, be sure to attach an external keyboard and mouse first. Then, find a small magnet from your fridge.

    Connect the external display to your MacBook, slide the magnet around the outside lip of the MacBook screen until it goes right to sleep. Could it be you have a MacBook that has gotten rather hot when this problem occurs? Maybe you even have a rather old MacBook that has a swollen battery that is pressing onto internal components like the touchpad so severely that they start malfunctioning?

    Hint Options

    MacBook Pro Retina, inch, Early 3. In that case, start out by cleaning the connectors and ports with a hair-pin, and maybe a tiny bit of alcohol-based detergent. Same problem here. The Macbook is brand new and has been installed fresh latest Mojave All updates have been installed.

    Troubleshooting: macOS

    Monitor has been factory reset. Computer has been rebooted. Both mac and monitor persist claiming no cable is connected.


    1. Using the Option Key in Display Preferences.
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    6. Determine OS X version from the command line (Example).

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