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I have a new MacBook Pro 13-inch (mid 2012). I have never liked the backlit keyboard. I am completely a touch-typist and I never look down at the keys. I just find the light going on and off to be annoying.

I have heard about Lab Tick, which provides a slider to control the level of the backlight, but what I really want is a command-line defaults write to simply turn the lights off.

Does anyone know of a means to do this?

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up vote 14 down vote accepted

Go to System Preferences -> Keyboard and, in the Keyboard tab, turn off (uncheck) "Automatically illuminate keyboard in low light". Then, if you turn the brightness down all the way, it should never turn on. If you then want it on (say, a friend who is not a touch-typist), just use the brightness keys on the top row.

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Good enough. The lights still come on whenever I log out, and until I log back in again, and when I boot up. I suppose that's the best I can do. – user9290 Jun 13 '12 at 20:31
@WheatWilliams That's odd. I keep my backlight off nearly all the time, and I've never seen that happen. – CajunLuke Jun 13 '12 at 20:40

New for 2014: You'd think you should be able to take care of this in one location but, no.

  1. Open System Preferences, then open Keyboard, and in the first 'Keyboard' tab panel, uncheck "Adjust keyboard brightness in low light". Also here, be sure to check the "Use all F1, F2, etc. keys as standard function keys" checkbox so that your 'fn' key works. Close the panel.

  2. While holding down the fn key, press F5. You should see a semi-transparent control with a setting sun icon. Tap or hold until the bars go down to 0.

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If you don't check the "Use all F1, F2, etc. keys as standard function keys" box, you can just hit F5 without using fn. – 0942v8653 Sep 6 '14 at 23:25
This worked for me on OS X 10.9 Mavericks - the accepted answer was not enough. Fairly poor UX to have to Google this much just to find this out. – RichVel Apr 1 '15 at 6:13

Click on the fn button at the bottom left and then click F5, you can completely turn off the backlight by turning it low.

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1. Pressing fn+F# is incorrect based on default settings. 2. This answer has already been taken into account in the first answer back in 2012, and doesn't help if auto-enable is turned on. – grgarside Feb 10 '14 at 16:27

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