Samsung Series 5 display brightness keys not working after Windows 10 upgrade

I have a Samsung NP530U3C-A0AUK that came with Windows 8. I recently upgraded from Windows 8.1 to Windows 10, and since then, the screen brightness adjust function keys (fn+F2 and fn+F3) have stopped working.

The volume adjust function keys (fn+F6/F7/F8) and touchpad disable key (fn+F5) do still work.

I've tried updating the following drivers: Intel HD Graphics 4000 display adapter, Generic PnP Monitor and Standard PS/2 Keyboard, but this didn't work.

Is there a registry setting that can be changed to re-enable the brightness keys?

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