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Article ID: 911133 - Last Review: June 20, 2014 - Revision: 1.0

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Symptoms

When you touch the screen with a stylus pen on a Microsoft Windows XP Tablet PC Edition 2005-based computer, you receive a Stop error message that is similar to the following:
STOP 0x0000007F(parameter1, parameter2, parameter3, parameter4)
UNEXPECTED_KERNEL_MODE_TRAP
Note The parameter values may vary.

Cause

This problem occurs in the following scenario:
  1. The in-box Wacompen.sys digitizer driver is installed on the computer.
  2. An external monitor is connected to the computer.
  3. You start the computer when the lid is closed.
  4. You open the lid after you start the computer.
  5. You touch the screen with a stylus pen.

Resolution

To resolve this problem, install the hotfix that is described in the "Resolution" section, and then restart the computer when the lid is open. If you restart the computer when the lid is closed after you install this hotfix, the digitizer and the stylus pen may not work at all until you restart the computer at least one time when the lid is open.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support)
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.

Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Wacompen.sys1.7.2600.280414,20830-Nov-200501:08x86

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

For more information, click the following article number to view the article in the Microsoft Knowledge Base:
824684  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use (http://go.microsoft.com/fwlink/?LinkId=151500) for other considerations.
Keywords: 
kbautohotfix kbexpertisebeginner kbqfe kbhotfixserver KB911133
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