APM or ACPI Power MGNT

ACPI (Advanced Configuration and Power Interface) is an industry specification for the efficient handling of power consumption in desktop and mobile computers. ACPI specifies how a computer's basic input/output system, operating system, and peripheral devices communicate with each other about power usage.

APM:
ACPI is in part a response to global concerns about energy conservation and environmental control. ACPI replaces Intel's SL technology and the more recent APM (Advanced Power Management) technology. Based on the collaborative effort of Intel, Toshiba, and Microsoft, ACPI moves away from power management that simply times out during inactivity to a more sophisticated demand-based power management. ACPI components collect information about power consumption from the computer and gives that information to the operating system. The operating system then distributes power to the different computer components on an as-needed basis. With ACPI, the computer can power itself down toa deep sleep state but still be capable of responding to an incoming phone call or a timed backup procedure. Another feature of ACPI is the "hibernation" mode. Before the computer goes into a deep sleep or hibernation, the contents of RAM are written to an image file and saved on the hard drive. When the computer is turned back on, the image file is reloaded, eliminating the need to reboot the system and open applications.

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