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Macbook Pro has the "keyboard illumination keys" F5 and F6.

For some reason, there is a small "no entry" sign whenever I hit those keys.

The keyboard's illumination doesn't seem to change at all, how do we fix this problem?

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up vote 3 down vote accepted

The laptop makes note of ambient lighting and disables keyboard backlight when it's not dark. This is similar to the automatic display brightness system. Both are there to save power.

Your keyboard backlight should work in a dark room or if you cover your iSight camera so the laptop thinks it's dark.

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heys cool, btw where's the sensor? –  Pacerier Apr 29 '11 at 9:52
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@Pacerier: I think it's right next to the web camera. (So blocking the webcam makes the computer think it's dark) –  dancek Apr 29 '11 at 12:37
    
cool =) –  Pacerier May 1 '11 at 0:35
    
on my 2008 mac book pro 17", the system is quite slow to respond. After covering up the camera and / or switching off the option in system preferences to automatically dim the backlight, I actually had to wait around a minute (!) before the f5 and f6 keys came back to life. I had a lot going on with the computer, but still it was a bit surprising to have to wait so long. –  Reb.Cabin Jul 12 '13 at 22:52
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