My laptop:

Macbook Pro (Retina, 13-inch, Mid 2014)

Processor 2.6 GHz Intel Core i5

Memory 8 GB 1600 MHz DDR3

Graphics Intel Iris 1536 MB

OSX Mojave Version 10.14.3

My screen broke, so I bought this replacement screen and fixed it myself.

Everything seems to work fine except that my brightness stays at max and won't adjust, unless I put my laptop into "sleep" mode after a reboot.

This problem has persisted since OSX High Sierra, so I don't think Mojave has anything to do with it. It has also persisted across multiple OS re-installations.

Also note that the problem doesn't exist when using windows 10 BOOTCAMP, and seems to only happen when using OSX.

What is the cause for this bug and what can I do to troubleshoot this? Is this a known issue?

Any advice and/or links to related topics would be appreciated!


I am able to press the brightness keys (F1 and F2) and the small popup window shows up (shown below). Unless I put my computer in "sleep" mode first, changing the brightness has no effect on the brightness of the computer, despite it indicating that the brightness level is changing.

brightness popup

  • I'm assuming you're using F1 and F2 to change the brightness -- does holding Fn and using F1 and F2 make any difference? Second thing to try: have a look in the App Store for a software brightness controller (e.g. Brightness Slider - this is from a search, I have not tried it) - does that make any difference? Commented Mar 23, 2019 at 18:59
  • @PeteCooper I added an edit to my question clarifying this. Thanks for your help. Commented Mar 23, 2019 at 19:30


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