Backlit keyboard won't light up after recent lion update!

I just updated Lion today and now my backlit keys wont light up anymore. When i use the f5 / f6 keys a phrobited sign shows on my screen.
Does anyone know anything about this??
Many thanks in advance!
Kaato.

That sign means that the ambient light sensor detected enough light for you to see the keyboard on your own. Try a dark room or cover the webcam are with your hand it should light up on it's own or allow you to turn it on by pressing the keys.

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