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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?

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What happens when you press F5 or F6? You may need to hold Fn (function) when doing so depending on your keyboard settings. I want you to look for this overlay to appear on your screen when pressing F5/F6, or Fn F5/F6. –  Jason Salaz Sep 25 '12 at 12:24
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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".

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