Some Laptops May Not Suspend Properly, Backlight Stays On (312826)

The information in this article applies to:

Microsoft Windows XP Home Edition
Microsoft Windows XP Professional

This article was previously published under Q312826

SYMPTOMS

When you either close the lid of your laptop computer or press the closure-detection button for the lid, the back-lit LCD display may not turn off on Windows XP-based computers.

If you manually enter suspend mode by pressing FN-F4, the backlight for the LCD display turns off. This problem does not occur if the laptop is connected to a CRT monitor.

CAUSE

This problem occurs because there is an issue with the code in the Videoprt.sys video miniport driver.

RESOLUTION

To resolve this problem, obtain the latest service pack for Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

322389 How to Obtain the Latest Windows XP Service Pack

The English-language version of this fix should have the following file attributes or later:

   Date         Time   Version       Size   File name     
   -----------------------------------------------------
   03-DEC-2001  15:57  5.1.2600.21  65,024  Videoprt.sys

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows XP Service Pack 1.

Modification Type:	Minor	Last Reviewed:	9/26/2005
Keywords:	kbHotfixServer kbQFE kbbug kbdisplay kbDriver kbfix kbHardware kbWinXPsp1fix KB312826