Keyboard backlight doesn't turn on auto in dark

hi i bought macbook pro retina 13(osx mavericks) few days back i observed that my keyboard backlight doesn't turn on auto in dark i have to manually turn it on every time so i want to know whether apple has removed this auto turn on in new mavericks or is i m having a issue with my keyboard

Auto keyboard backlight still exists: System Preferences -> Keyboard -> "Adjust keyboard brightness in low light". Is that option selected? If so, deselect and select it again. If that doesn't work: Intel-based Macs: Resetting the System Management Controller (SMC)

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