Fedora - How to changes brightness?

Just compile the possible solution on how to fix the issued in changes the brightness on your laptop.
Fedora 17
Add acpi_backlight=vendor in your kernel parameter.
* Edit /boot/grub2/grub.cfg and the the data below

linux   /vmlinuz-3.3.4-5.fc17.i686.PAE root=UUID=92d834db-f8d4-4075-9b3e-4d4c79ca8dfa ro nomodeset rd.md=0 rd.lvm=0 rd.dm=0 SYSFONT=True  KEYTABLE=us rd.luks=0 LANG=en_US.UTF-8 rhgb quiet 
acpi_backlight=vendor

* Edit the /etc/X11/xorg.conf and add Option "RegistryDwords" "EnableBrightnessControl=1" in the "Device" section.

Section "Device"
        Identifier "Videocard0"
        Driver "vesa"

       Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

* Last thing reboot your system to take the changes.


* Or if the two process will not work. try also.

echo 3 > /sys/class/backlight/WHAT_EVER_THE_DIR/brightness

Fedora 15
1. Edit /etc/Xorg/xorg.conf to add the following line under Section "Device":

Option "RegistryDwords" "EnableBrightnessControl=1"

2. Edit /etc/default/grub and addacpi_osi=Linuxto theGRUB_CMDLINE_LINUX` setting, i.e.

GRUB_CMDLINE_LINUX="acpi_osi=Linux"

Finally is to update the grub and reboot

# sudo update-grub
# reboot.

Fedora 14
Find here fedora-14-how-to-make-samsung-fn

Some info about the issue here.
http://forums.fedoraforum.org/showthread.php?t=283868
http://www.coffeepowered.net/2011/11/13/enabling-brightness-controls-on-an-hp-envy-17-under-fedora-16/