I recently updated to Ubuntu 13.10 and realized that scripts in /etc/pm/power.d do not fire anymore. Has something changed in the way pm-utils work? Is there any way to make it work.

I have a script which automatically changes the brightness on my monitor if the power cable is plugged out and I would like to be able to use it again.

UPDATE
I realized that the main reason why the scripts aren't executing automatically is because the upowerd is not running. If i run upower --monitor, the scripts start to execute whenever I connect or disconnect the charger.

The man upowerd says the following:

upowerd provides the org.freedesktop.UPower service on the system message bus. Users or administrators should never need to start this daemon as it will be automatically started by dbus-daemon(1) whenever an application calls into the org.freedesktop.UPower service.

Why doesn't the upowerd start automatically on boot?