I need to install a custom init script to turn on the laptop's back light (Acer Aspire 7715z). I copied the small script to /etc/init.d and made it executable by using chmod. My problem is that need init to call the script after udev. I have tried to install the script by update-rc.d script defaults which created a link in /etc/rcS.d but with the incorrect order. I also tried to brute force install the script by creating a link in /etc/rcS.d using ln --symbolic script-absolute-path link-name.

Both these approaches failed. The script is for Debian (Wheezy currently testing). The script is this:

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#!/bin/sh


### BEGIN INIT INFO
# Provides: bkltguard
# Required-Start: $udev
# Required-Stop:
# Default-Start: S
# Default-Stop:
# Short-Description: turns the back light on
# Description: this small script turns the
# laptop back light on. It is used to workaround
# the "modesetting kernel bug".
### END INIT INFO


setpci -s 00:02.0 F4.B=00
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What am I doing wrong?

Did you try just to put it in rc.local and chmod +x rc.local?

The problem with rc.local is that it is called at every runlevel change and I don't what that to happen. I only need my script to be executed just once when udev finishes its chores because it is after udev's initialisation that the problem is manifesting itself.

I think, my best option is to have a good look at the script that is called just after udev and mimic it. I also suspecting my script may be failing because currently init scripts are called concurrently and I must make sure my script is run after udev finishes its initialisation of /dev.