The battery power drains more quickly than you expect from a portable computer that is running Windows Server 2003

When you unplug the AC power from a portable computer that is running Microsoft Windows Server 2003, the battery power drains more quickly than you expect. Therefore, the operating system shuts down prematurely.

This problem may occur if one of the following conditions is true:

• The portable computer cannot enter the deep "Advanced Configuration and Power Interface" (ACPI) processor idle sleep states (C-states).
  
  This issue occurs when the USB 2.0 driver lets the asynchronous scheduler component run continuously. This action prevents the processor from entering the C-states.
  
  C-states save power when the processor is not busy. C-states range from C0 to C4. Typically, an idle portable computer uses the C3 state and the C4 state to preserve battery power. If an idle portable computer cannot enter or maintain the C3 state or the C4 state, the battery power drains more quickly.
  
  To resolve this issue, install the download that is available in this article.
• The USB host controller cannot turn off.
  
  Typically, this issue occurs when a device is removed from a nested USB hub that is attached to the host controller. The host controller does not recognize the device removal. Therefore, the host controller cannot turn off. The processor cannot enter the C-states.
  
  You cannot resolve this issue by installing the download that is available in this article. To resolve this issue, contact Microsoft Customer Support Services (CSS).
• The USB host controller uses the periodic scheduler for USB devices.
  
  This issue typically occurs when a device that relies on the periodic scheduler is attached to the host controller. This device may be an isochronous (isoch) device, such as an audio device. Alternatively, this device may be an interrupt device, such as a mouse device or a keyboard device.
  
  You cannot resolve this issue by installing the download that is available in this article. To resolve this issue, contact CSS.

Note Various factors can affect the battery power for portable computers. Therefore, there may not be any improvement in battery power after you install the download that is available in this article.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Server 2003 with SP2, x86-based versions

Windows Server 2003 with SP2, x64-based versions

Windows Server 2003 with SP2, Itanium-based versions

Windows Server 2003 with SP1, x86-based versions

Windows Server 2003, x64-based versions

Windows Server 2003 with SP1, Itanium-based versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For information about this problem in Microsoft Windows XP, click the following article number to view the article in the Microsoft Knowledge Base:

For more information about the terms that are used to describe software updates, click the following article number to view the article in the Microsoft Knowledge Base: