Disable Screen Mirroring Keystroke

Solution 1:

There doesn't seem to be an entry for the shortcut in com.apple.symbolichotkeys.plist. The media keys cannot be configured in DefaultKeyBinding.dict or keylayout files. I didn't find any hidden preferences with strings either.

I was able to disable it with KeyRemap4MacBook, but only on my laptop's keyboard; not on an Apple Wireless Keyboard.

1. Save a file like this as ~/Library/Application Support/KeyRemap4MacBook/private.xml

   <?xml version="1.0"?>
   <root>
     <item>
       <name>Disable Command-F1</name>
       <identifier>private.disable.command.f1</identifier>
       <autogen>--ConsumerToConsumer-- ConsumerKeyCode::BRIGHTNESS_DOWN, ModifierFlag::COMMAND_L, ConsumerKeyCode::BRIGHTNESS_DOWN</autogen>
       <autogen>--ConsumerToConsumer-- ConsumerKeyCode::BRIGHTNESS_DOWN, ModifierFlag::COMMAND_R, ConsumerKeyCode::BRIGHTNESS_DOWN</autogen>
     </item>
   </root>
   

2. Press the ReloadXML button and enable the new remapping in the first tab