Odd keystroke sequence cant be deactivated

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

You can use PlistBuddy and defaults:

/usr/libexec/PlistBuddy -c 'Delete NSServicesStatus:"(null) - test2 - runWorkflowAsService"' ~/Library/Preferences/pbs.plist 2>/dev/null;defaults write pbs NSServicesStatus -dict-add '"(null) - test2 - runWorkflowAsService"' '{key_equivalent = "^~@2";}'

The PlistBuddy command is not needed if there is not an existing entry for the service. Replace test2 with the name of the service. Quit and reopen applications to apply the changes.

^~@2 is control-option-command-2. See https://web.archive.org/web/20161220060333/http://osxnotes.net/keybindings.html.