FIX: Inconsistent gap count can cause 1394 devices to not enumerate

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Article ID: 329256 - View products that this article applies to.
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You may experience either of the following symptoms:
  • 1394 devices do not enumerate when plugged into the 1394 bus.
  • 1394 devices can disappear from the 1394 bus when other 1394 devices are plugged into the 1394 bus.


The 1394 OHCI host controller driver contains a problem that sometimes prevents stable enumeration because it cannot acquire a consistent gap count across all nodes.


Service pack information

To resolve this problem, obtain the latest service pack for Windows XP. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack

Hotfix 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.
   Date        Time  Version      Size   File name     Platform
   Windows XP SP1 

   07-Oct-2002 12:57 5.1.2600.101 49,792 1394bus.sys   Windows XP 
   24-Aug-2002 03:20 5.1.2600.100 46,720 61883.sys     Windows XP 
   30-Aug-2002 09:55 5.1.2600.100 24,448 Sonydcam.sys  Windows XP 

   Windows XP SP2 

   07-Oct-2002 13:01 5.1.2600.1130 50,688 1394bus.sys  Windows XP 
The following file is available for download from the Microsoft Download Center:
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Download the q329256_WXP_SP2_x86_ENU.exe package now. Release Date: November 1, 2002

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.


Article ID: 329256 - Last Review: January 12, 2015 - Revision: 8.0
Applies to
  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
kbnosurvey kbarchive atdownload kbqfe kbtshoot kbwinxpsp2fix kbwinxppresp2fix kbbug kbfix KB329256

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