Reduce display brightness in Fedora startup

Hi all writing some tech notes again after a longtime, and these days I started using Fedora 18 and I had a problem that when fedora boots it come with the full brightness and I need to reduce it manually to save battery life.

After a small googling I found a nice way, thats xbacklight it is used to adjust the backlight brightness where supported. It finds all outputs on the X server supporting backlight brightness control and changes them all in the same way.

First of all we need to Install xbacklight with
# yum install xbacklight

After installation we can set the display brightness with

xbacklight -set 60

The above command reduce the brightness to 60%. Now the problem is how to do this automatically when system starts. The simplest solution is, make a linux script (.sh file) and add that to start up.

Making .sh file

Open gEdit and type

#!/bin/bash
xbacklight -set 60

save it as [your_file_name].sh in any folder, (I saved it Documents folder)

Make script run in startup

Before make it startup, check whether the script is working perfactly, so open terminal and run script with

./[your_file_name].sh

If its working perfectly, type

# gnome-session-properties

image

This command will open the Startup application prefrences there click Add button to add the script and restart the system

You’re DONE!! 🙂

xbacklight synopsis

xbacklight [-help] [-display display] [-get] [-set percent] [-inc percent] [-dec percent]

-get : Print out the current backlight brightness of each output with such a control. The brightness is represented as a percentage of the maximum brightness supported.

-set : percent Sets each backlight brightness to the specified level. -inc percent Increases brightness by the specified amount.

-dec : percent Decreases brightness by the specified amount.

-help : Print out a summary of the usage and exit.

-time : milliseconds Length of time to spend fading the backlight between old and new value. Default is 200.

-steps : number Number of steps to take while fading. Default is 20.

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