The Backlit Keyboard on MacBook Air its working upside down

Why does my MacBook Air backlit keyboard turns on in a well litted room and turns off in the dark? What can i do to solve it?

try playing around with the F5 and F6 buttons. They are supposed to control the keyboard lighting.
also go to Keyboard & Mouses in the system preference. There is an option there that says "illuminate keyboard in low light conditions". Make sure that box is ticked.
Drag the bar on the "turn off when computer is not in use for" to Never.
Hope this helps.

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