KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q82763: PS/2 Appears to Hang When Exiting Windows 3.1

Article: Q82763
Product(s): Microsoft Windows 95.x Retail Product
Version(s): WINDOWS:3.1,3.11
Operating System(s): 
Keyword(s): win31
Last Modified: 11-OCT-1999

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows versions 3.1, 3.11 
-------------------------------------------------------------------------------


SYMPTOMS
========

Some IBM PS/2 models may appear to stop responding (hang) when you exit Windows
version 3.1. The computer eventually restarts; however, it remains frozen for up
to a minute while the mouse port is reinitialized.

This problem is most severe on PS/2 models 56 and 57. It also occurs on models
50z, 55sx, 70, 80, 90, and 95.

CAUSE
=====

This behavior is caused by a problem in the IBM PS/2 mouse BIOS.

WORKAROUND
==========

The problem can be corrected by adding the following line to the [386Enh]
section of SYSTEM.INI:

  InitPS2MouseAtExit=FALSE

This prevents Windows from attempting to reinitialize the PS/2-style mouse port
prior to exiting to MS-DOS. This may cause problems when you run some
mouse-aware, MS-DOS-based applications after exiting Windows.


PS/2 products included here are manufactured by a vendor independent of
Microsoft; we make no warranty, implied or otherwise, regarding these products'
performance or reliability.

Additional query words: 3.10 3.11 InitPS2MouseAtExit ps2 hangs init slow Initps2mouseportatexit

======================================================================
Keywords          : win31 
Technology        : kbWin3xSearch kbZNotKeyword3 kbWin310 kbWin311
Version           : WINDOWS:3.1,3.11

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1986-2002.