My F1 and F2 keys ceased controlling screen brightness. How to restore the function of these keys?

Hey there, Rob,

Thanks for visiting the Apple Support Communities. I understand from your post that the F1 and F2 keys on your keyboard aren't adjusting the display brightness as expected. I'm happy to help!

You can use the "Change the default function key behavior" section of How to use the function keys on your Mac - Apple Support to restore your default function key shortcuts.

Have a good day!

You're welcome, Rob!

It was our pleasure.

Cheers.