[Solved] Power Management settings

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http://crunchbanglinux.org – The screen on my laptop is going to sleep after 10 minutes on ac.  Adjusting using the Power Management settings from the menu doesn't have any effect.  The box for "Monitor power management control" is checked.The xfce4-power-management.xml file is as follows:<?xml version="1.0" encoding="UTF-8"?><channel name="xfce4-power-manager" version="1.0">  <property name="xfce4-power-manager" type="empty">    <property name="power-button-action" type="empty"/> (HowTos)