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Power consumption may be more than you expect on a computer that is running Windows XP or Windows Server 2003

Article ID: 918005 - View products that this article applies to.

Hotfix Download Available

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SYMPTOMS

You may experience one of the following issues with Windows XP or Windows Server 2003:

A desktop computer or a server that is running Windows XP or Windows Server 2003 may consume more power than you expect.
When you unplug the AC power on a portable computer, the battery may drain more quickly than you expect. Then, the operating system may shut down prematurely.

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CAUSE

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

The portable computer cannot enter the deeper Advanced Configuration and Power Interface (ACPI) processor idle sleep states.

This occurs when the USB 2.0 driver leaves the asynchronous scheduler component running continuously. This prevents the processor from entering the deeper ACPI processor idle sleep states (C-states). C-states save power when the processor is not busy. These states range from C0 to C3 or C4. Typically, an idle portable computer uses the C3 and C4 states to reduce power consumption. If an idle portable computer cannot enter or maintain the C3 or C4 states, the power consumption is increased. This problem is fixed by installing the download that is available in this article.
The USB host controller cannot turn off.

This typically occurs when devices are removed from a nested USB hub that is attached to the host controller. The host controller does not recognize the device removal. Therefore, the controller is never turned off. This prevents the processor from entering the ACPI processor idle sleep states. This problem is not fixed by installing the download that is available in this article.
The USB host controller uses the periodic scheduler for USB 2.0 devices.

This typically occurs when devices that rely on the periodic scheduler are attached to the host controller. These may be isochronous (Isoch) devices such as audio devices. Or, they may be interrupt devices such as mouse or keyboard. This problem is not fixed by installing the download that is available in this article.

Note Many factors can affect power consumption other than the kind of USB devices and their configuration. For example, many programs that run on portable computers may have different power consumption requirements. Additionally, the different kinds of batteries that are used can also affect battery power. Therefore, you may not notice any improvement in power consumption after you apply this update.

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RESOLUTION

Windows XP update information

The following file is available for download from the Microsoft download center:

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Download the Windows XP (KB918005) package now.

(http://www.microsoft.com/downloads/details.aspx?familyid=78E80592-3C1D-46BE-99C2-B0DABAAE4370&amp;displaylang=en)

Prerequisites

You must install Windows XP SP2 before you install the update.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

322389

(http://support.microsoft.com/kb/322389/ )

How to obtain the latest Windows XP service pack

Restart requirement

After you apply this update, the update forces a restart of the computer.

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.

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File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Usbehci.sys	5.1.2600.3020	30,208	23-Oct-2006	11:14	x86	SP2	SP2QFE
Usbhub.sys	5.1.2600.3020	59,264	23-Oct-2006	11:14	x86	SP2	SP2QFE
Usbohci.sys	5.1.2600.3020	17,152	23-Oct-2006	11:14	x86	SP2	SP2QFE
Usbport.sys	5.1.2600.3020	143,488	23-Oct-2006	11:14	x86	SP2	SP2QFE
Usbuhci.sys	5.1.2600.3020	20,608	23-Oct-2006	11:14	x86	SP2	SP2QFE

Windows Server 2003 hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

(http://support.microsoft.com/contactus/?ws=support)

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

You must install Windows Server 2003 Service Pack 1 (SP1) or Windows Server 2003 SP2 before you install the hotfix.

Note The x64-based versions of Windows do not require you to install Windows Server 2003 SP1 before you install the hotfix.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

889100

(http://support.microsoft.com/kb/889100/ )

How to obtain the latest service pack for Windows Server 2003

Restart requirement

After you apply this hotfix, the hotfix forces a restart of the computer.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix 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 and Windows XP, x64-based versions

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File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Usbehci.sys	5.2.3790.2951	51,968	07-Jun-2007	18:26	x64	SP1	SP1QFE
Usbhub.sys	5.2.3790.2951	103,936	07-Jun-2007	18:26	x64	SP1	SP1QFE
Usbohci.sys	5.2.3790.2951	26,880	07-Jun-2007	18:26	x64	SP1	SP1QFE
Usbport.sys	5.2.3790.2951	213,504	07-Jun-2007	18:26	x64	SP1	SP1QFE
Usbuhci.sys	5.2.3790.2951	32,896	07-Jun-2007	18:26	x64	SP1	SP1QFE
Usbehci.sys	5.2.3790.4095	51,968	07-Jun-2007	18:33	x64	SP2	SP2QFE
Usbhub.sys	5.2.3790.4095	103,936	07-Jun-2007	18:33	x64	SP2	SP2QFE
Usbohci.sys	5.2.3790.4095	26,880	07-Jun-2007	18:33	x64	SP2	SP2QFE
Usbport.sys	5.2.3790.4095	213,504	07-Jun-2007	18:33	x64	SP2	SP2QFE
Usbuhci.sys	5.2.3790.4095	32,896	07-Jun-2007	18:33	x64	SP2	SP2QFE

Windows Server 2003, Itanium-based versions

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File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Usbehci.sys	5.2.3790.2951	100,352	07-Jun-2007	18:27	Not Applicable	SP1	SP1QFE
Usbhub.sys	5.2.3790.2951	201,216	07-Jun-2007	18:27	IA-64	SP1	SP1QFE
Usbohci.sys	5.2.3790.2951	50,304	07-Jun-2007	18:27	Not Applicable	SP1	SP1QFE
Usbport.sys	5.2.3790.2951	414,720	07-Jun-2007	18:27	IA-64	SP1	SP1QFE
Usbuhci.sys	5.2.3790.2951	72,192	07-Jun-2007	18:27	Not Applicable	SP1	SP1QFE
Usbehci.sys	5.2.3790.4095	100,352	07-Jun-2007	18:33	Not Applicable	SP2	SP2QFE
Usbhub.sys	5.2.3790.4095	201,216	07-Jun-2007	18:33	IA-64	SP2	SP2QFE
Usbohci.sys	5.2.3790.4095	50,304	07-Jun-2007	18:33	Not Applicable	SP2	SP2QFE
Usbport.sys	5.2.3790.4095	414,720	07-Jun-2007	18:33	IA-64	SP2	SP2QFE
Usbuhci.sys	5.2.3790.4095	72,192	07-Jun-2007	18:33	Not Applicable	SP2	SP2QFE

Windows Server 2003, x86-based versions

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File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Usbehci.sys	5.2.3790.2951	30,592	07-Jun-2007	17:15	Not Applicable	SP1	SP1QFE
Usbhub.sys	5.2.3790.2951	60,928	07-Jun-2007	17:15	x86	SP1	SP1QFE
Usbohci.sys	5.2.3790.2951	17,536	07-Jun-2007	17:15	Not Applicable	SP1	SP1QFE
Usbport.sys	5.2.3790.2951	146,432	07-Jun-2007	17:15	x86	SP1	SP1QFE
Usbuhci.sys	5.2.3790.2951	20,992	07-Jun-2007	17:15	Not Applicable	SP1	SP1QFE
Usbehci.sys	5.2.3790.4095	30,592	07-Jun-2007	16:34	Not Applicable	SP2	SP2QFE
Usbhub.sys	5.2.3790.4095	60,928	07-Jun-2007	16:34	x86	SP2	SP2QFE
Usbohci.sys	5.2.3790.4095	17,536	07-Jun-2007	16:34	Not Applicable	SP2	SP2QFE
Usbport.sys	5.2.3790.4095	146,432	07-Jun-2007	16:34	x86	SP	SP2QFE
Usbuhci.sys	5.2.3790.4095	20,992	07-Jun-2007	16:34	Not Applicable	SP2	SP2QFE

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STATUS

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

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MORE INFORMATION

Note If you use Windows Vista, you can visit the following Microsoft Web page for help with power consumption and battery life problems:

Fix problems in which power consumption is more than expected or the battery life is short

(http://support.microsoft.com/gp/windows_battery_power_settings)

The x64-based versions of Windows Server 2003 and Windows XP Professional x64 Edition are based on the Windows Server 2003 code tree. Service and support activities for Windows XP Professional x64 Edition use the Windows Server 2003 code tree and do not use the Windows XP client tree. For more information about the x64-based versions of Windows Server 2003 and Windows XP Professional x64 Edition, click the following article number to view the article in the Microsoft Knowledge Base:

888733

(http://support.microsoft.com/kb/888733/ )

A description of the x64-based versions of Windows Server 2003 and of Windows XP Professional x64 Edition

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:

824684

(http://support.microsoft.com/kb/824684/ )

Description of the standard terminology that is used to describe Microsoft software updates

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