I Can’t Adjust my Backlight on my Dell Studio 1558 Laptop though the keyboard controls or the control in my Desktop Environment(Gnome). I have tried http://askubuntu.com/a/401311/48372 but it doesn’t work. The only thing that
"echo 200 > /sys/class/backlight/intel_backlight/brightness"
In the terminal. It would be quite nice if someone could help me with it.
Here is my /etc/default/grub http://hastebin.com/orawisalud.vala