Incorrect Video Memory Amount is Detected for WD90C24a. (165916)


The information in this article applies to:

  • Microsoft Windows NT Workstation 4.0
  • Microsoft Windows NT Server 4.0
This article was previously published under Q165916

SYMPTOMS

The detected video driver WD90c24a will only recognize 512 KB of the 1 MB of video memory on the system, limiting the video resolution to 640x480 and 16 colors. Windows NT 4.0 installed on a Compaq Contura 410c laptop with a passive matrix screen will exhibit this problem.

CAUSE

In Windows NT 3.51, the driver incorrectly configured WD90c24a as a 90c31, so higher resolutions could be reached. In Windows NT 4.0, the chip identification will not allow this to happen. The WD90c24a driver will be installed and higher resolutions will not be possible.

STATUS

Microsoft has confirmed this to be a problem in Windows NT version 4.0.

A supported fix is now available, but has not been fully regression tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.
Modification Type:MajorLast Reviewed:8/9/2001
Keywords:kbbug KB165916
©2002 Microsoft Corporation. All rights reserved.