How to fix the Brightness problem in ubuntu 14.4?
It is very simple follows these steps
1. Open a terminal and create the following configuration file, if it does not exist:
sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf
2. Now we need to edit this file. You can use any editor be it a terminal one or graphical.
sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf
3. Add the following lines to this file:
Section "Device" Identifier "card0" Driver "intel" Option "Backlight" "intel_backlight" BusID "PCI:0:2:0"EndSection
4. Log out and log in back.
The brightness control should be working through function keys now.
Hope this helps 🙂 .