Microsoft KB Archive/941413

= The resolution of an external display may unexpectedly change when you log on to a portable computer that is running Windows Vista =

Article ID: 941413

Article Last Modified on 11/26/2007

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APPLIES TO


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

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SYMPTOMS
Consider the following scenario. You are running Windows Vista on a portable computer. You connect an external display to the computer, and then you configure the desktop area to extend across both displays. This configuration is known as &quot;Extended desktop&quot; mode. You turn off the computer, and then you start the computer while the lid is closed. Or, you start the computer, and then you quickly close the lid.

When you log on in this scenario, the resolution of the external display may unexpectedly change. The external display may not use the same resolution as was previously used.



CAUSE
This problem occurs because the Transient Multimon Manager (TMM) feature of Windows Vista requires that the portable computer's lid be open when you log on to the computer. If you log on while the laptop lid is closed, TMM is disabled.



WORKAROUND
To work around this problem, temporarily open the lid when you log on. Then, close the lid if you want.



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 Transient Multimon Manager (TMM), visit the following Microsoft Web site:

http://www.microsoft.com/whdc/system/platform/mobilepc/tmm.mspx

Additional query words: Mobile PC

Keywords: kbtshoot kbbug kbnofix kbexpertisebeginner KB941413

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