Some Laptops May Not Suspend Properly, Backlight Stays On

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Article ID: 312826 - View products that this article applies to.
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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.


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


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


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.


Article ID: 312826 - Last Review: May 17, 2007 - Revision: 1.3
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
kbhotfixserver kbqfe kbbug kbdisplay kbdriver kbfix kbhardware kbwinxpsp1fix KB312826

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