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On a Windows 7 laptop with hybrid graphics and duplicate displays, the primary display changes after you restart the machine

SYMPTOMS
Consider the following scenario:

On a Windows 7 laptop with hybrid graphics,

Connect multiple monitors to the system, including 2 DVI or DisplayPort monitors
Configure duplicate (clone) displays between the DVI or DisplayPort monitors.
Set the duplicated external monitors to be the primary display.
Restart the system.

You may observe that the primary display has been changed to the laptop screen instead of the external monitors.

CAUSE
With multiple graphics adapters and some monitors that are configured for duplicate (clone) mode, the monitor configuration may be saved incorrectly to the registry. As a result, when Windows attempts to restore the display configuration on the next boot, it fails and the configuration previously set may not get restored properly.  
RESOLUTION
To work around this issue, manually reset the primary display configuration after restarting the machine.  
MORE INFORMATION
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
Properties

Article ID: 2406828 - Last Review: 08/16/2011 01:35:00 - Revision: 3.1

  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Enterprise
  • Windows 7 Ultimate
  • KB2406828
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