Troubleshooting Event Log Error Messages 11 and 12

 Last reviewed: May 12, 1997
Article ID: Q106373
The information in this article applies to:
  • Microsoft Windows NT operating system version 3.1
  • Microsoft Windows NT Advanced Server version 3.1
  • Microsoft Windows NT Workstation versions 3.5 and 3.51
  • Microsoft Windows NT Server versions 3.5 and 3.51

SYMPTOMS

When the number of mouse or keyboard events buffered internally by the driver in nonpaged pool memory is too low, one of the following error messages gets logged in the Event Viewer: 

   Source      Category      Event      User
   -----------------------------------------
   Mouclass    None          11         N/A

   -or-

   Source      Category      Event      User
   -----------------------------------------
   i8042prt    None          12         N/A
Both of the above error messages have the following description: 

   The ring buffer that stores incoming mouse data has overflowed (buffer
   size is configurable through the Registry).

RESOLUTION

WARNING: Using Registry Editor incorrectly can cause 

         serious, system-wide problems that may require you to
         reinstall Windows NT to correct them. Microsoft cannot
         guarantee that any problems resulting from the use of
         Registry Editor can be solved. Use this tool at your own
         risk.
Use the Registry Editor (REGEDT32.EXE) to edit the following entry:

HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/i8042prt/Parameters

Make the value for KeyboardDataQueueSize and/or MouseDataQueueSize larger.

NOTE: The default value for both of these is 64.

The above service (i8042prt) name may vary, depending the type of mouse you are using.

Additional query words: prodnt
Keywords : kbhw kbprint nthw ntprint
Version : 3.1 3.5 3.51
Platform : WINDOWS

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Last reviewed: May 12, 1997
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