Ask Different is a question and answer site for power users of Apple hardware and software. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

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?

share|improve this question
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

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".

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.