As indicated: open a terminal and "su" to root or login to your system as root.
Then execute:
/usr/sbin/rcpowersaved start
This will start the powersave daemon.
Maybe you'll also need to use /usr/sbin/chkconfig to make it start automatically at each boot.
But I'm not sure about that.
Could you also please post your Linux distro or update your profile to include it?
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