Public bug reported:

After upgrading to Saucy, on my Lenovo IdeaPad Z570 with Intel HD
Graphics 3000, it is no longer possible to control the LCD brightness
using the hardware brightness control keys. Likewise for the KDE power
management settings or the battery icon on my Kubuntu Plasma tray. (I
don't use GNOME/Unity.) Until Raring I did not have this problem.

There is a workaround available from
http://askubuntu.com/questions/362894/changing-the-brightness-stopped-
working-in-13-10-saucy-salamander i.e. doing the following command on a
terminal:

echo 150 | sudo tee /sys/class/backlight/intel_backlight/brightness

where 150 is on the scale of 0 to whatever is given within
/sys/class/backlight/intel_backlight/max_brightness.

Based on this I wrote a GUI which however needs to be run using
sudo/kdesudo/gksudo. I have attached it.

Bug #1241745 also relates to the same problem on Saucy but apparently
relates to an NVidia driver and I was asked to track this as a separate
bug
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1241745/comments/17

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Workaround GUI for changing brightness"
   
https://bugs.launchpad.net/bugs/1255428/+attachment/3918055/+files/intel-lcd.py

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https://bugs.launchpad.net/bugs/1255428

Title:
  LCD brightness control keys and widget do not work on Intel Graphics
  on Saucy

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