Public bug reported:

Hi,
on my new Acer TravelMate P253 notebook, with ubuntu 14.04 desktop I can't 
modify LCD screen brghtness: by pressing the normal key combination for this 
function (Fn+Left / Fn+Right) the screen brightness applet correctly shows up 
on the screen, and its level correctly goes up and down when pressing the 
function keys, but nothing actually happens, and the screen alway stays at its 
maximum brightness.
Thank you, your suggestions are always welcome.
Adalberto

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: trusty

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https://bugs.launchpad.net/bugs/1330640

Title:
  Ubuntu 14.04 on Acer TravelMate P253: LCD screen brightness always at
  maximum level

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