So apparently I cannot modify my Macbook's backlight using the keyboard shortcut:

enter image description here

I'm pretty sure it will work again if I restart it. But I wonder what may cause this: is it perhaps an issue with my hardware, or just some OS glitch caused by something insignificant?

Macbook Pro Retina, 15" mid 2014. El Capitan 10.11.


You set it with the F5 and F6 keys, and it should not change after that, except for the setting SystemPreferences->Keyboard->Keyboard "adjust keyboard brightness in low light".

  • Did you even read the original post? The screenshot in the question shows what happens when you try using the F5/F6 keys to adjust the brightness when this bug occurs. – Mahmoud Al-Qudsi Sep 17 '17 at 17:56

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