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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.

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Reset to default
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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".

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  • 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, 2017 at 17:56

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