Microsoft KB Archive/935892

= A Tablet PC that is running Windows XP Tablet PC Edition 2005 stops responding (hangs) when you put it into standby or into hibernation =

Article ID: 935892

Article Last Modified on 4/27/2007

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APPLIES TO


 * Microsoft Windows XP Tablet PC Edition 2005

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
When you try to put a Tablet PC that is running Microsoft Windows XP Tablet PC Edition 2005 into standby or into hibernation, it stops responding (hangs).

This problem occurs when one or more USB composite devices that support selective suspension are installed.



CAUSE
This problem occurs because a deadlock condition occurs when the USB hub driver (Usbhub.sys) synchronously sends the PowerDeviceD0 (D0) power state I/O request packet (IRP). IRPs are queued, but the IRPs are not completed. This deadlock condition prevents the Tablet PC from entering standby or hibernation.



Hotfix information
A supported hotfix is now available from Microsoft. However, 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 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

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.

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.

How to enable the hotfix
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

After you apply this hotfix, follow these steps to enable the hotfix for the USB composite device:  Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry subkey:

Note Vid_ is the vendor ID of the device. Pid_ is the product ID of the device.  is the instance ID of the device. On the Edit menu, point to New, and then click DWORD Value. Type IdleCompletionAsyncPowerIrp, and then press ENTER. On the Edit menu, click Modify.</li> Type 1 in the Value data box, and then click OK.</li> On the File menu, click Exit to exit Registry Editor.</li></ol>

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STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

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MORE INFORMATION
For more information about terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: mode sleep state S3 S4 race

Keywords: kbwinxppresp3fix kbbug kbfix kbhotfixserver kbqfe kbpubtypekc kbexpertiseinter KB935892

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