The Frequency Selector functionality may not be available
on your GNOME Desktop by default. Please consult your system
administrator, vendor documentation, or the documentation that came with
this software.
To set the CPU frequency, (left-)click on the monitor and a menu
will be shown. This menu will offer you a list of available frequencies
and/or frequency governors for your machine.
You can choose whether you want to show available frequencies or
governors in the Preferences.
See  for more information.
