Ubuntu 12.04 idle screen dim timer

The following procedure no longer works in Ubuntu 14.04 and newer.

The idle screen timer in Ubuntu dims the laptop screen automatically.

Check timer

gsettings get org.gnome.settings-daemon.plugins.power idle-dim-time

Set timer

This example sets the screen dim timer to 90 seconds.

gsettings set org.gnome.settings-daemon.plugins.power idle-dim-time 90