Ubuntu 14.04 is a new version of Ubuntu operating system.It will release in next month. At this moment we use Ubuntu daily build version. Daily build versions available at cdimage.ubuntu.com. Since Ubuntu 13.10, we are facing a brightness issue on Intel machines. Brightness can’t control with slider. We found same  issue on Ubuntu 14.04  too, that means Developers didn’t fix. Don’t worry we can fix it with simple tweaks. Follow below instructions and fix it.

Open your Terminal

Enter this command, you need to enter password after that

sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

If you are using Linux mint 16 ( Mate ) you need to replace gedit with default MATE text editor.

Enter password

You can see gedit window ( gedit text editor), add these command and save.

Section “Device”
Identifier “card0”
Driver “intel”
Option “Backlight” “intel_backlight”
BusID “PCI:0:2:0”


Gedit window

Save it and close terminal

Restart or log off your computer.

Open settings and select brightness and lock.

Adjust brightness

You can see changes while moving slider. I took photos of my desktop, but all looks similar, But you can see changes with your eyes.

This method works 100%, if you have any doubts or issues, please ask me…