Microsoft KB Archive/263126

= ACPI Laptop Computer Hangs When Docked with Display Blanked =

Article ID: 263126

Article Last Modified on 1/27/2007

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APPLIES TO


 * Microsoft Windows 98 Standard Edition
 * Microsoft Windows 98 Second Edition

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This article was previously published under Q263126



SYMPTOMS
When you dock an Advanced Configuration and Power Interface (ACPI) laptop computer with the screen blanked in power-saving mode, the computer may stop responding (hang).



CAUSE
When you dock a laptop computer the appropriate hardware profile must be applied, which requires that the configuration manager re-enumerate all devices. During this operation, the configuration manager causes a WM_DEVICECHANGE message broadcast to all programs and device drivers.

Some S3-compatible video drivers may issue a Video Electronics Standards Association-compliant (VESA-compliant) BIOS interrupt 10h for video hardware control. When the video hardware is in an S3 sleep state (low wake-up latency), it may return unexpected values to BIOS input/output (I/O) probes, which can cause the BIOS in some computers to hang in an endless loop.



WORKAROUND
To work around this behavior, return the display to normal before docking the computer by moving the mouse, or by providing other input.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbenv kbhardware kbprb KB263126

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