Whenever I try to raise/lower my screen brightness with the F1 and F2 buttons, it takes a couple of seconds before the brightness changes, and I can't stop it from raising/lowering the brightness

Raising/lowering the brightness is also a very slow process

Is there any way to bring this back to normal function/speed?

I have a mid 2012 13" MacBook Pro running macOS Sierra.

  • Sorry, editing to make clearer
    – Sam
    Oct 26, 2018 at 17:07
  • @Allan mid-2012 13' macbook pro macOS Sierra
    – Sam
    Oct 26, 2018 at 17:08
  • Have you tried booting into Safe Mode (hold Shift while booting) and seeing if the problem persists?
    – Allan
    Oct 26, 2018 at 18:08

1 Answer 1


I suggest you reset your SMC (System Management Controller).

The process can be tricky, but you will know if you succeeded if the MagSafe Plug light changes color momentarily as you do the reset.

The reset of SMC depends on your Mac model, so follow the instructions here.

  • Added model in comment
    – Sam
    Oct 26, 2018 at 17:10
  • Two things: what happens if I don't succeed, and the light always flickers :/
    – Sam
    Oct 26, 2018 at 17:12
  • The light will briefly change color (not flicker)
    – Ruskes
    Oct 26, 2018 at 17:15
  • Hey, it worked for about a day, and now it's back to how it was. Is there a more permanent fix?
    – Sam
    Oct 29, 2018 at 6:45
  • so something is corrupting your SMC, try resetting it again to confirm.
    – Ruskes
    Oct 29, 2018 at 7:05

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