OK I am sitting in front of a toshiba equium running XP Home edition,
Here is what I have done:-
First of all open up the control panel.
You should see an icon for toshiba power saver. This is where you can configure your power settings.
Secondly there is an icon in control panel for power options. If you go into this under the power scheme tab, there is a drop down list of all available power options. Select the toshiba option and this will ensure that your settings in the toshiba console will be used.
Hope this helps, if you need clarification please let me know : -)