FIX: Incorrect 1394 Node Becomes Cycle Master (326464)

The information in this article applies to:

Microsoft Windows XP Professional

This article was previously published under Q326464

SYMPTOMS

After you start your computer, although some conferencing cameras enumerate correctly and appear in Device Manager with no errors, they do not stream video.

CAUSE

With certain 1394 topologies at startup time, the 1394 host controller driver (1394Bus.sys/OHCI1394.sys) incorrectly chooses the wrong 1394 node as the Cycle Master. This results in no start cycle packets and, therefore, no isochronous streaming.

WORKAROUND

To work around this problem so that the camera correctly streams video, follow these steps:

Unplug the conferencing camera.
Plug the camera in again.
Restart the program; this causes a bus reset and solves the problem.

RESOLUTION

The English version of this fix has the file attributes (or later) 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     Operating system
-------------------------------------------------------------------------
15-AUG-2002  09:31  5.1.2600.54    49,792  1394BUS.SYS  Windows XP

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

Modification Type:	Minor	Last Reviewed:	9/27/2005
Keywords:	kbHotfixServer kbQFE kbbug kbfix kbOSWin2000fix kbWinXPsp1fix KB326464