I think we need more info on your hardware.

Mine works almost perfectly:
the screen brightness increases or decreases as wanted, but the popup 
notification is late to update the progress bar, and after a few 
increases/decrease, it get so confused it stops updating, and even stay visible 
for a long time, before disappearing, and then you cannot get it back...

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HP 6730s brightness control
https://bugs.launchpad.net/bugs/325734
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