Microsoft KB Archive/934429

= The &quot;Allow hybrid sleep&quot; option is intermittently missing from the Advanced Settings tab of the Power Options dialog box in Windows Vista =

Article ID: 934429

Article Last Modified on 8/29/2007

-

APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Enterprise
 * Windows Vista Business
 * Windows Vista Home Premium
 * Windows Vista Home Basic
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Business 64-bit Edition
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Home Basic 64-bit Edition
 * Windows Vista Starter

-



SYMPTOMS
You experience the following symptoms on a computer that is running Windows Vista:  The Allow hybrid sleep option is missing from the Advanced settings tab of the Power Options dialog box in Windows Vista. When you run the powercfg.exe -a command to list the power states that are supported on the computer, the output that appears includes the following lines:

The system firmware does not support this standby state.

Hybrid Sleep



These symptoms occur intermittently. When you restart the computer, the Allow hybrid sleep option reappears. Additionally, when you run the powercfg.exe -a command again, the output that appears includes a line that resembles the following:

The following sleep states are available on this system: Hybrid Sleep



CAUSE
This problem occurs in scenarios where a race condition exists between the Monitor.sys driver and a kernel setting.



Hotfix information
A supported hotfix is now 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 service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or 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. To create a separate service request, visit the following Microsoft Web site:

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

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 Vista, 64-bit versions


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



MORE INFORMATION
For more information about the Powercfg.exe tool in Windows Vista, visit the following Microsoft Web site:

http://technet2.microsoft.com/WindowsVista/en/library/dc8e252e-b7d7-46af-b946-e118b39cae371033.mspx?mfr=true

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 plan

Keywords: kbbug kbfix kbqfe kbpubtypekc kbexpertiseinter kbhotfixserver kbwinvistapostrtmfix KB934429

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.