Circle with diagonal line when trying to adjust keyboard backlight

I have ever since I bought my Early "11 MBP 15" been able to use keyboard backlight in any ambient light conditions, at full or no strenght. However as I tried to clean up something I spilled on the keyboard, a magic key combination rendered the function keys for keyboard backlight useless. Instead I get the circle with a diagonal dash through it. In preferences keyboard backlight is set to on... Please help!

Oh I get it... It's supposed to be off if enough ambient light is around. Guess that makes sense... Covering the light sensor next to the iSight camera dimmed the screen and keyboard light came on!

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