My backlit keyboard keys not working?

How come my backlit keyboard keys not working? When I try to use them I get a circle with a line running through it?

cpickrell wrote:
Jax, the backlight is currently usinig a sensor to turn the light on and off for you. This uses the least amount of battery. If you want to test or control the lighting yourself, go to the Apple Menu, select System Preferences, click on the Keyboard icon. Here you can turn the automatic setting on and off. If it is off, you can use they keyboard keys to turn the keyboard lighting on and off.
Exactly!

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