PCI Video Adapter May Not Function on Secondary PCI Bus (236030)
The information in this article applies to:
- Microsoft Windows 2000 Server
- Microsoft Windows 2000 Professional
- Microsoft Windows NT Server 4.0
- Microsoft Windows NT Workstation 4.0
- Microsoft Windows 98
This article was previously published under Q236030 SYMPTOMS
On a computer with two PCI buses that are joined by a PCI-to-PCI bridge, a PCI video adapter that is placed on the secondary PCI bus may not function properly. You may experience any of the following symptoms:
- The video adapter is not recognized at the hardware level.
- Windows NT 4.0 may report parity errors while it is loading the video drivers.
- Video distortion may occur.
- The secondary video adapter is not detected while you are configuring multiple monitor support in Windows 2000 or Windows 98.
CAUSE
This behavior can occur if the computer's BIOS does not correctly set the VGA Enable and ISA Enable bits on the PCI bridges. If the BIOS does not correctly set these bits on the PCI bridges, a resource conflict can occur between the bridges.
RESOLUTION
To resolve this issue, contact the manufacturer of the BIOS to inquire about obtaining a BIOS revision that configures the VGA Enable bit and the ISA Enable bit properly for the PCI bridges.
As a workaround, you may be able to install the PCI video adapter in one of the slots on the primary PCI bus. Consult your computer documentation to determine which PCI slots make up the primary bus on your computer.
Modification Type: | Minor | Last Reviewed: | 12/20/2004 |
---|
Keywords: | kbenv kbHardware kbprb KB236030 |
---|
|