How to view or change dim time of display in Ubuntu

Ubuntu dims the display when the computer is idle for a certain period.

The current value of this time in seconds can be seen using:

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

To change this dim time value, for example to 300 seconds:

$ gsettings set org.gnome.settings-daemon.plugins.power idle-dim-time 300

Tried with: Ubuntu 12.04 LTS