How to power off dedicated graphics card in Fedora or any Linux

This tutorial shows you 'How to power off dedicated graphics card in Fedora'  on new laptops and PCs having dual graphics.

Many a time Fedora uses only the Integrated graphics housed inside intel chipset.

But both dedicated ( ATI Radeon or Nvidia ) and integrated  (intel's) are always ON thus draining the power and overheating the machine all the time.

Steps :

• Open Terminal and type

1. sudo -i

       "sudo -i"  is used to grand root permission
Enter password when prompted

• now run
cat /sys/kernel/debug/vgaswitcheroo/switch

you will get output as

0:IGD:+:Pwr:0000:00:02.0
1:DIS:   :Pwr:0000:01:00.0

IGD = intel graphics card , internal
DIS = discrete gd , like ati radeon or nvidia

+ sign shows that only intel is using

Pwr shows both Graphics devices are powered on

• now run
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

echo writes OFF to switch script which then offs gd which is not in use
now again run
          cat /sys/kernel/debug/vgaswitcheroo/switch

you will get output as

0: IGD: + :Pwr:0000:00:02.0
1: DIS:      :Off:0000:01:00.0

================================================================================

To make this permanent 

run in terminal

gedit /etc/rc.d/rc.local

and add this to the file

#! /bin/bash
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

save file 

and run in terminal

chmod +x /etc/rc.d/rc.local