I also have Intel graphics in a HP laptop
This fix also works in 14.04:
http://askubuntu.com/questions/362894/changing-the-brightness-stopped-working-in-13-10-saucy-salamander
If you're using intel video card do:
sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
Add the following in the empty file then log out and log in again or
reboot. That should fix your problem.
Section "Device"
Identifier "card0"
Driver "intel"
Option "Backlight" "intel_backlight"
BusID "PCI:0:2:0"
EndSection
Thanks Tatakai Wasumi for that solution!
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https://bugs.launchpad.net/bugs/1255428
Title:
8086:0116 [Lenovo IdeaPad Z570] LCD brightness control keys and widget
do not work on Intel Graphics on Saucy
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