Mac Air backlit keyboard light is ON always.

The keyboard light does not respond to ambient light. As I remember when i first bought it, the keyboard lights does not turn on in brightly lit environment.
But now it's on ALWAYS. I always feel that my mac air gets hot easier than before... when it gets really hot, performance is low.
( A month ago, I took my mac air to APPLE to fix cuz no sound came out of loudspeakers output nor earphones output. In the end they told me they had replaced something inside to fix the problem. But the keyboard light and easily-get-hot problem remains...I'm not sure if the staff remembered to check that for me.)

Reset SMC.     http://support.apple.com/kb/HT3964
Choose the method for:
"Resetting SMC on portables with a battery you should not remove on your own".
System Preferences > Keyboard > Keyboard
Adjust the settings.
Is it set to "Never"?

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