Apple - MBP Touch Bar Mirror Displays Keyboard Shorcut

The new shortcut is Command-Dim Brightness. It even makes sense in the following way:

Assuming that you take advantage of the touch bar, and it displays the system controls instead of the function keys then the hand gesture is exactly the same as before when you would have pressed Command-F1 since the Dim Brightness button is where F1 would be:

The annoying thing is that if you have an application-aware touch bar configuration, then you have to bring up the system controls touch bar configuration first.

This is why, in some cases, the Display Menu (in the App Store) which adds a status item in your menu bar (and includes a Mirror Screen choice) is a good option.

Workaround found, works for me, late 2016 MBP 15":

System Preferences > Keyboard > Press Fn key to > "Show control strip"

fn + Command + "screen brightness less" (where F1 would be otherwise) = toggle mirroring

I have the opposite problem.. was lacking a stock option to disable this shortcut!

I've remapped Cmd,F1 to display_brightness_decrement using Karabiner Elements - no need to interfere with other shortcuts!

You can install the key mapping from here: disable_cmd_f1_screen_mirroring by following instructions here: configuration-complex-modifications.

Alternatively, to achieve this manually: you can place the following file in ~/.config/karabiner/assets/complex_modifications/disable_cmd_f1_screen_mirroring.json then activate it via Karabiner Elements:

• Navigate to Karabiner Elements > Preferences > Complex Modifications > Rules
• Add Rule
• Enable your new rule

{
    "title": "Disable Cmd+F1 Toggle Screen Mirroring",
    "rules": [
        {
            "description": "Disable Cmd+F1 Toggle Screen Mirroring Shortcut (map to display_brightness_decrement), see https://discussions.apple.com/thread/2793101",
            "manipulators": [
                {
                    "type": "basic",
                    "description": "",
                    "from": {
                        "key_code": "f1",
                        "modifiers": {
                            "mandatory": [
                                "command"
                            ]
                        }
                    },
                    "to": [
                        {
                            "key_code": "display_brightness_decrement"
                        }
                    ]
                }
            ]
        }
    ]
}