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f33e652
(Get the code!)
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.