Microsoft KB Archive/253764

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Overview of Power Management in Windows 2000


The information in this article applies to:

  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server


This article contains a brief overview of power management in Windows 2000. Windows 2000 supports both Advanced Power Management (APM) and Advanced Configuration and Power Interface (ACPI) power management.


Windows 2000 supports ACPI-compliant BIOS versions, and also some BIOS versions based on APM and Plug and Play designs.

ACPI is an open industry specification that defines a flexible and extensible hardware interface for the motherboard. Software designers use this specification to integrate power-management features throughout a computer system, including hardware, the operating system, and programs. This integration enables Windows 2000 to determine which programs are active and handle all of the power-management resources for computer subsystems and peripherals.

APM consists of one or more layers of software that support power management in computers with power-manageable hardware. APM defines the hardware-independent software interface between hardware-specific power-management software and an operating system power-management policy driver. It masks the details of the hardware, allowing higher-level software to use APM without any knowledge of the hardware interface.

For information about which ACPI-based BIOS versions are ACPI-compliant, check the Hardware Compatibility List (HCL) for Windows 2000.

For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

Q216573 How Windows 2000 Determines ACPI Compatibility

Or, check the ACPI BIOS lists at the following Microsoft Web site:

For more information on compatible hardware for Windows 2000, consult the Windows NT Hardware Compatibility List (HCL). This is a compilation of computers and computer hardware that have been extensively tested with Windows NT for stability and compatibility. Microsoft Product Support Services uses the HCL to determine whether or not a computer is supported for use with the Windows NT operating system. The latest HCL is available from the following Microsoft Web site:

NOTE: To obtain the text file of the Windows 2000 HCL, click the following Microsoft FTP site:

Additional query words:

Keywords : kbenv kbhw KBW2KHOME
Issue type : kbinfo
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000Serv kbwin2000ServSearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro kbWinAdvServSearch

Last Reviewed: October 24, 2000
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