Brightness Key F1/F2 not working on MBP

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Level 1

11 points

Brightness Key F1/F2 not working on MBP

Screen brightness, F1 and F2 key not working

We have a MacBook Pro running MAC OS Lion. Somehow the F1/F2 key stopped working.

When pressed, I can see the brightness icon and the white bars appear on the display but nothing changes when press the F1/F2 key. However I can change the brightness from the system preference under the display settings manyally.

Posted on Nov 29, 2012 9:54 AM

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Answer 1

Best reply

borgeano

Level 2

285 points

Nov 29, 2012 10:04 AM in response to Liyun Yu

Try resetting the PRAM:

Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

(from support.apple.com/kb/HT1379)

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Answer 2

adaptabi

Level 1

4 points

Oct 3, 2017 2:53 AM in response to Liyun Yu

After 3 days research, with no luck, I was able to restore the F1/F2 keyboard to work again and control the display brightnes in w10 / bootcamp after I did a SMC reset on my mid 2015 MBP 15"

https://support.apple.com/en-us/HT201295

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