A small utility that checks if you have an external display connected and if you are currently mirroring. If both of these are true, it uses brightness to set your display brightness to 0.
You’ll need to
brew install brightness and then symlink that to
/usr/local/bin for TurnOffDisplayWhenMirroring to work out of the box.
I’d like to remove the need for
brightness, but don’t yet know how to integrate that code into this utility.
I have this set up in Keyboard Maestro to run on login and/or system wake so when I login to my computer, it shuts the built-in display off.
Turn the display completely off
Turn the display to full brightness