I recently switched to KDE5, I notice that I can't increase the brightness anymore.

Got to the keyboard shortcuts options and found the action to do so, but when I tried to setup the shortcut, it wouldnt take my function key. I use the function key to print screen, and that works well, but when trying to use it for other things like the let say the numbers, it wont come up.

Went to keyboard, and saw that the original setup was Generic 101 and switch it to DELL Latitude but still wouldnt catch my fn key for what I wanted.

I use Archlinux with KDE 5.6 on a Dell Latitude. Please help.

Update: tried using xev and didnt return anything when clicking fn or fn+up