How do I make brightness settings persist across rebooting?

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http://askubuntu.com – I'm using Ubuntu 12.04 with up to date packages running on a Dell Inspiron N4030 laptop with an ATI Radeon HD 5400 graphics card. I'm using the new Catalyst 12.6 graphics driver (this version already fixed various bug with linux kernel 3.0) The Problem is when I reduce the brightness and then restart it. The brightness is not saved, even when I use a startup script: cat /etc/rc.local "echo 0 > /sys/class/backlight/acpi_video0/brightness" When I use this script, it works initially, but then after a second the brightness changes to level 15 as if a second script is at work. Sometime when (HowTos)