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Keyboard Illumination Locked? It’s the Light Sensor

Keyboard Illumination Lock icon
Can’t turn on your MacBook Pro or Air’s keyboard backlighting? No it’s probably not broken, it’s most likely the light sensor. If the ambient light sensor on MacBook Pro and MacBook Air models detects too much light, the keyboard illumination will disable itself and refuse to turn on, showing the above locked image instead.
You can force the keyboard illumination to turn back on by covering up this ambient light sensor, which is located directly to the left of the iSight/FaceTime camera on MacBook Pro and MacBook Air models:
MacBook Air Light Sensor Location
If you look carefully at that area on the screens border, you’ll see tiny perforations where light is detected. Covering the sensor will enable the backlit keys to turn on, usually instantly, and you can then adjust the backlight as usual with the F5 and F6 keys.

Backlit keyboard illumination on a MacBook Pro or Air
Why does this happen at ll? It’s actually a power saving feature. Your MacBook determines that if it’s bright enough, the glowing keys aren’t needed, so it disables them to maximize battery life. Now you know.
Great question from reader Andrew O.