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The behavior of the keyboard backlight appears to be influenced by the brightness setting of the main screen. When you are in a dark setting... I've noticed that the keyboard backlight will not come on when the screen backlight is set at the lowest setting. At the second-lowest setting, it comes on after you press a key. All other settings, it should come on when you slide it out, although I've noticed that there is sometimes a few-second delay.
Experiment with different brightness settings in a dark room and see if that takes some of the mystery out of the behavior of the keyboard backlight.
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