I have a non-Unibody MacBook Pro running 10.8.2. After I installed Mountain Lion, the keyboard backlight does not light up any more. Is it a connection with the new OS, or is it a defect of my Mac?
MacOS – How to get the keyboard backlight back after Mountain Lion upgrade
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I don't know if it's Lion or a hardware feature, but on my MacBook Air, the system changes the keyboard lighting (and screen brightness) depending on the ambient brightness, which is detected by a sensor near the iSight lens at the top of the screen. In bright surroundings, the keyboard lighting is disabled and pressing F5 or F6 does nothing.
gentmatt’s answer seems useful!
Alternatively, you could try going to System Preferences → Keyboard, and unchecking the “Automatically illuminate keyboard in low light” setting. That should prevent the “disabled” icon from your screenshot altogether.
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Best Answer
You're not alone, expect an OS X update to address this very soon, until then others have had success by disabling the auto dim in low light feature.
System Preferences > Keyboard > uncheck "Adjust keyboard brightness in low light".