I'm on a Lenovo E430 laptop with 13.04 installed. When I adjust the function brightness keys, it will decrease my brightness with one tap to 1% brightness. If I try to bump the brightness up it does nothing at all. On the flip side, if I go into system settings and adjust the brightness slider, it works fine. What's the difference? Clearly these two things aren't tied together since one works and the other does not... is there a way to tie in the brightness slider in system settings to the function keys instead?