Comment 8 for bug 806032

The attached upstart script contains the script from the earlier post, but fixes an issue in validating the _ADR result (which would result in writing a 0 to the field, which was the default value)

Install it with:
sudo install -m 644 cadl-brightness.conf /etc/init
sudo start cadl-brightness

The next boot, the hack will automatically be loaded. Removing the hack is as easy as:

sudo rm /etc/init/cadl-brightness.conf