Microsoft KB Archive/106373

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Troubleshooting Event Log Error Messages 11 and 12

Article ID: 106373

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Server 3.5
  • Microsoft Windows NT Server 3.51
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Workstation 3.51
  • Microsoft Windows NT Advanced Server 3.1

This article was previously published under Q106373


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


   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).


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:


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.

Note: If changing the registry does not solve the behavior, disable the NetFlex adapter driver from the devices. With some of the NetFlex adapters, if the card is not disabled, the events can occur and the computer may stop responding.

Additional query words: prodnt

Keywords: kbprint kbhardware KB106373