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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.

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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.  

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Resolution

To work around this issue, manually reset the primary display configuration after restarting the machine.  

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Keywords: consumerwin7track, kb

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Article Info
Article ID : 2406828
Revision : 1
Created on : 1/7/2017
Published on : 8/16/2011
Exists online : False
Views : 131