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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.

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

Hotfix informationloadTOCNode(2, 'resolution'); A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it 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 XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site: 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.PrerequisitesloadTOCNode(3, 'resolution'); No prerequisites are required.Restart requirementloadTOCNode(3, 'resolution'); You must restart the computer after you apply this hotfix.Hotfix replacement informationloadTOCNode(3, 'resolution'); This hotfix does not replace any other hotfixes.File informationloadTOCNode(3, 'resolution'); 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 nameFile versionFile sizeDateTimePlatformSP requirementService branchNtkrnlmp.exe5.1.2600.27742,136,06412-Oct-200500:18x86SP2SP2QFENtkrnlpa.exe5.1.2600.27742,057,34411-Oct-200523:54x86SP2SP2QFENtkrpamp.exe5.1.2600.27742,015,23211-Oct-200523:54x86SP2SP2QFENtoskrnl.exe5.1.2600.27742,180,09612-Oct-200500:20x86SP2SP2QFE

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

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: