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I am newbie Mac user and I recently stumbled upon this annoying F6 problem: when I debug in Xcode or Eclipse, I must use fn+F6 to run the debugger. By default, F6 is the function key to adjust the keyboard light. How can I reverse its functionality, in order to use F6 for the debugger and fn+F6 for the keyboard light?

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3 Answers 3

up vote 12 down vote accepted

System Preferences -> Keyboard -> Keyboard tab -> check "Use all F1, F2, etc. keys as standard function keys"

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it's fantastic!! –  dan zen Oct 10 '12 at 5:08

And Paula allows you to set the global F1-F12 vs "special key" mode based on the focused application.

Paula Smart Mode Preferences

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You can also invert single keys with FunctionFlip:

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