I know that on my other ubuntu installations (kubuntu, lubuntu, xubuntu and mint) there was this neat little tweak on by default where when my cursor is hovering the battery indicator icon, i could dim or brighten my laptop display with my mousewheel.
Sadly, in elementary os it seems this is deactivated. How can I activate it?
Using elementary OS 0.3.1 Freya (64-bit) (Ubuntu 14.04)