Keyboard Illumination Locked? It’s the Light Sensor

[Geek]

<div class="KonaBody"><p><img src="http://osxdaily.com/wp-content/uploads/2011/09/keyboard-illumination-lock.jpg" alt="Keyboard Illumination Lock icon " title="keyboard-illumination-lock" width="620" height="297" class="aligncenter size-full wp-image-21491" /></p>

<p>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. </p>

<p>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:</p>

<p><img src="http://osxdaily.com/wp-content/uploads/2011/09/macbook-air-light-sensor.jpg" alt="MacBook Air Light Sensor Location" title="macbook-air-light-sensor" width="620" height="79" class="aligncenter size-full wp-image-21493" /></p>

<p>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.

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<img src="http://osxdaily.com/wp-content/uploads/2011/09/backlit-keyboard-illumination-mac.jpg" alt="Backlit keyboard illumination on a MacBook Pro or Air" title="backlit-keyboard-illumination-mac" width="620" height="243" class="aligncenter size-full wp-image-21494" /></p>

<p>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.</p>

<p><em>Great question from reader Andrew O.</em></p>

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