Backlight keyboard for W540

who knows how can i activate the backlight keyboard for my W540... I have download all the drivers but the backlight just doesn't lit up under anykind of lighting environments.
Thank you for your help!
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How to know if you have backlit keyboard on W540?
I'm certain I selected it in the configurator, although if the IT guy followed through and also selected it in the order is another question. But nothing happens when I hit Fn+Spacebar. Is there a way to know for sure?
CPU-Z says my model is 20BH001XUS, if that tells anything.

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