Linux Ubuntu 12.04 - Ati / AMD discrete graphics

After searching "A LOT" on the web, forums, etc... i found a page that has a tip that works to change linux xserver to discrete graphics.

http://thealarmclocksixam.wordpress.com/2012/03/23/ubuntu-12-04-and-hybrid-graphics-on-sony-vaio-s/

I used this on my laptop HP dv6

Here are the steps;

1. edit /etc/modprobe.d/blacklist.conf

2. add these 2 lines to the end of the file 
# radeon
blacklist radeon

3. edit /etc/rc.local

modprobe radeon
chown -R $USER:$USER /sys/kernel/debug
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch

4. reboot and it should be good

5. you can check if it worked

cat /sys/kernel/debug/vgaswitcheroo/switch

no more fan's noise, no more temperature...

Very nice hack

:D