Power management provides the ability to control and manage the electrical power usage
of a computer system or device. Power management enables systems to conserve energy
by using less power when idle and by shutting down completely when not
in use. For example, desktop computer systems can use a significant amount of
power and often are left idle, particularly at night. Power management software can
detect that the system is not being used. Accordingly, power management can power
down the system or some of its components.
This chapter provides information on the following subjects: