Q. How can I disable power management on my Fedora Core Linux system?
A. You need to stop APM (Advanced Power Management) service called apmd. It can be stopped by calling /etc/init.d/ script as follows:
# /etc/init.d/apmd stop
If you don't want this service to return after a reboot type following command and deselect apmd
Or use chkconfig command:
#/sbin/chkconfig apmd off