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

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 '18 at 17:10
  • Two things: what happens if I don't succeed, and the light always flickers :/ – Sam Oct 26 '18 at 17:12
  • The light will briefly change color (not flicker) – Ruskes Oct 26 '18 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 '18 at 6:45
  • so something is corrupting your SMC, try resetting it again to confirm. – Ruskes Oct 29 '18 at 7:05

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