I have an ugly workaround for my Asus K40IJ.

Fn F5/F6 does nothing. The Brightness indicator flashes on  the first
push, and then seems to delay its indication long after I have pressed
the keys.

My default power management brightness is set to 30%, and the laptop
appears to respect this option. However, upon adding the brightness
applet and attempting to adjust the brightness, the screen instantly
outputs at maximum brightness. No further toggling changes anything.

However, the following solution works, albeit it only functions for
individual windows, and not system wide.

In CompizConfig Settings Manager >  Accessibility > Opacity, Brightness
and Saturation

In the Brightness tab, I added key bindings to my scroll wheel that
enabled me to change the brightness of the screen by scrolling at the
right edge of the screen.

It achieves what I want, and I wonder if this may be a clue to fixing
this problem.

-- 
asus brightness hotkeys
https://bugs.launchpad.net/bugs/76593
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