Microsoft KB Archive/265864

= IntelliMouse Explorer Settings Lost When You Undock a Laptop Computer =

Article ID: 265864

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Windows 2000 Professional Edition
 * Microsoft IntelliMouse Explorer 4.0

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This article was previously published under Q265864



SYMPTOMS
If you undock and then dock your laptop computer, your IntelliMouse Explorer mouse settings may be lost. When this issue occurs, only the default left and right mouse buttons work.



CAUSE
Most docking stations have a PS/2-style mouse port. When you undock the laptop computer, Windows 2000 unloads the IntelliMouse Explorer mouse driver and installs the internal pointing device driver.

When you dock the laptop computer again, the computer manufacturer's BIOS may not unload the internal pointing device drivers and the device itself. Because the PS/2-style port is not Plug and Play and is designed for only a single device, the internal pointing device takes precedence over an external one. The PC99 HW Design guide states that manufacturers of mobile computers should design their computers to unload the internal pointing device and drivers when an external pointing device is attached.



RESOLUTION
To resolve this issue, contact the manufacturer of the laptop computer to inquire about obtaining an updated BIOS that resolves this issue.



WORKAROUND
To work around this issue, shut down or restart the laptop computer after you dock it.

Additional query words: ipd docking station

Keywords: kbenv kbhardware kbprb KB265864

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