You use a computer that is running Microsoft Windows XP with Service Pack 2 (SP2), Microsoft Windows XP Tablet PC Edition 2005, or Microsoft Windows XP Media Center Edition 2005. When you try to put the computer in hibernation, the computer occasionally does not hibernate. When this problem occurs, you receive an error message that is similar to the following: When you experience this problem, the hibernate feature is not available on the computer until you restart the computer.

This problem typically occurs when the computer uses 1 gigabyte (GB) or more of RAM.

Note The Windows XP SP2 features and components are included in Windows XP Tablet PC Edition 2005 and in Windows XP Media Center Edition 2005.

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This problem occurs because the Windows kernel power manager cannot obtain the memory resources that are required to prepare the computer to hibernate.

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Update information

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

Download the Update for Windows XP (KB909095) package now. (http://www.microsoft.com/downloads/details.aspx?familyid=9D20F96A-A8D6-4627-89F7-787CD9B3852C&displaylang=en)

Release Date: August 15, 2006

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

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Hotfix information

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you apply this hotfix.

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 tool in Control Panel.

File name	File version	File size	Date	Time	Platform	SP requirement	Service branch
Ntkrnlmp.exe	5.1.2600.2774	2,136,064	12-Oct-2005	00:18	x86	SP2	SP2QFE
Ntkrnlpa.exe	5.1.2600.2774	2,057,344	11-Oct-2005	23:54	x86	SP2	SP2QFE
Ntkrpamp.exe	5.1.2600.2774	2,015,232	11-Oct-2005	23:54	x86	SP2	SP2QFE
Ntoskrnl.exe	5.1.2600.2774	2,180,096	12-Oct-2005	00:20	x86	SP2	SP2QFE

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

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To prepare the computer to hibernate, the Windows kernel power manager requires a block of contiguous memory. The size of this contiguous memory is proportional to the number of physical memory regions that the computer is using. A computer that uses lots of RAM is likely to use more physical memory regions when the computer prepares to hibernate. Therefore, a larger amount of contiguous memory is required to prepare the computer to hibernate.

Additionally, the number of physical memory regions varies according to the programs, services, and device drivers that the computer uses. Therefore, the hibernate feature occasionally fails.

When the Windows kernel power manager detects that the hibernate feature has failed, the hibernate feature remains disabled until you restart the computer.

For more information about the terminology that is used in this article, click the following article number to view the article in the Microsoft Knowledge Base:

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