Hi Shawn,

I assume if you go to System->Preferences->Power Management, under the
"On AC Power" tab in the "Display" section if you slide the "Set display
brightness to:" slider, it's works as anticipated.  It's just the
Fn+Down Arrow and Fn+ Up Arrow hotkeys that you experience the
aggressive screen dimming?  Assuming this is the case, can you try
doing:

sudo /etc/init.d/hotkey-setup stop
Fn+Down or Fn+Up (to dim/brighten the screen and hopefully notice screen 
dimming working as you expect)
sudo /etc/init.d/hotkey-setup start

-- 
fn buttons dim and brighten screen to fast
https://bugs.launchpad.net/bugs/264947
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