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Windows may not detect a hot plugged PCI Express card

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Symptoms

Consider the following scenario:

You have a Windows Vista or Windows 7 machine.
After you boot the machine, you hot plug a PCI Express card.
The PCI Express card may not be detected in Windows.  

In the event that the card is detected, you may experience issues communicating with the device. 

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Cause

When the PCI Express card is hot plugged after the machine boots, Windows Vista and Windows 7 does not correctly apply the ACPI _HPP value to the device against the ACPI specification.  This can prevent the device from being detected properly.

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Resolution

Ensure that the PCI Express Card is plugged into the machine prior to the operating system booting. 

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Keywords: kb

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Article Info
Article ID : 2648077
Revision : 1
Created on : 1/7/2017
Published on : 11/28/2011
Exists online : False
Views : 212