FIX BRIGHTNESS CONTROL NOT WORKING FOR UBUNTU 14.04

On my Acer Aspire with Ubuntu 14.04, using function key to change the brighness did not yield any results. Brighness can not change. My laptop uses cards:  Nvidia Graphics and Intel graphics.

FIND VIDEO/GRAPHICS CARD IN UBUNTU

Run the command below in terminal to know what video card is used for the backlight/brightness:

ls /sys/class/backlight/

get_graphic_card_in_use

As you can see, the output for me is  intel_backlight. An indicator that the graphics card in use is Intel.

If your graphics card is Intel, you can proceed with the fix below:

FIX BRIGHNESS CONTROL ISSUE WITH INTEL CARD IN UBUNTU 14.04

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

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

Add the following lines to this file:

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"
EndSection

Save it. Log out and log in back. The brightness control should be working through function keys now.

 

Original post: http://itsfoss.com/fix-brightness-ubuntu-1310/

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