Display Adapters Branch Missing in Device Manager After Upgrade

ID: Q189235

The information in this article applies to:

SYMPTOMS

After you upgrade Microsoft Windows 95 to Windows 98, the Display Adapters branch may be missing in Device Manager.


CAUSE

This behavior can occur if your video adapter uses the Nvidia Riva 128 chip set, and is unable to acquire an interrupt request line (IRQ) during the Plug and Play detection portion of Windows 98 Setup.


RESOLUTION

To resolve this behavior, use either of the following methods to assign an IRQ to your video adapter:

Method 1

In your computer's Basic Input/Output System (BIOS), enable the Assign IRQ To VGA option. Note that the BIOS of some computers does not have this option.

For information about changing settings in the BIOS, see the documentation included with your computer or motherboard, or consult your computer's manufacturer.

Method 2

Disable PCI bus IRQ steering in Device Manager. For information about how to do so, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q182628
TITLE : How to Disable PCI Bus IRQ Steering in Windows.

For more information about PCI bus IRQ Steering, please see the following article in the Microsoft Knowledge Base:
ARTICLE-ID: Q182604
TITLE : Description of PCI Bus IRQ Steering.


MORE INFORMATION

The Nvidia Riva 128 chip set requires that an IRQ be assigned to it. 


Keywords          : kbdisplay kbhw kbsetup winpnp win98 
Version           : WINDOWS:98
Platform          : WINDOWS 
Issue type        : kbprb

Last Reviewed: February 11, 1999