1) Solution for brightness control for intel graphics in Ubuntu 13.10:
One other thing to try would be to create the file
/usr/share/X11/xorg.conf.d/20-intel.conf with the following content:
Option "Backlight" "intel_backlight"
2) Solution for brightness saving for intel graphics in Ubuntu 13.10:
In terminal run command:
My max brightness is 976, minimum 0. Run next command in terminal:
sudo gedit /etc/rc.local
Add following before the last line:
echo [value] > /sys/class/backlight/acpi_video0/brightness
where value is between 0 and max. Remember, never set 0 because 0 is black screen!