ley studio: video

29 June 2005

video

Performance of 1394 devices may decrease after you install Windows XP Service Pack 2
View products that this article applies to.
Article ID : 885222
Last Review : March 30, 2005
Revision : 3.0
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
On this page
SYMPTOMS
CAUSE
RESOLUTION
Update information
STATUS
MORE INFORMATION
APPLIES TO
SYMPTOMS
After you update your computer to Microsoft Windows XP Service Pack 2 (SP2), the performance of your 1394a or 1394b FireWire devices may be greatly decreased. A digital camera that uses S400 speed is an example of such a device.
Back to the top
CAUSE
This problem occurs if you connect a 1394a or 1394b FireWire device to a 1394b port. This problem occurs because Windows XP SP2 changes 1394b ports to S100 speed when you upgrade.
Back to the top
RESOLUTION
Update information
The following file is available for download from the Microsoft Download Center:

Download the Update for Windows XP (KB885222) package now.

Release Date: December 17, 2004

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.
Prerequisites
To install this update, you must have Windows XP SP2 installed.
Restart information
You must restart your computer after you install this update.
Update replacement information
This update is not replaced by any later hotfix or update.
Registry information
Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

After you install this update, if you add a host controller for a new 1394 device to your computer, you must add or modify the SidSpeed entry in the Windows registry for the new 1394 host controller. To do this, follow these steps:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\PCI\1394_hc_hw_id\1394_instance_id\Device Parameters
3. If the SidSpeed value does not exist in the right pane after you click the Device Parameters subkey in step 2, create it. To do this, point to New on the Edit menu, click DWORD Value, type SidSpeed, and then press ENTER.
4. Right-click SidSpeed, and then click Modify.
5. In the Value data box, type one of the values that are shown in the following table, and then click OK.
Value Speed
0 S100 speed
1 S200 speed
2 S400 speed (default value)
3 S400/S800 speed (Windows XP Service Pack 1 [SP1] value)
Note If you try to use a value that is larger than 3, SidSpeed will use a value of 0 (S100 speed).
6. Quit Registry Editor.
File information
The English version of this update 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 ----------------------------------------------------------------- 04-Nov-2004 20:59 5.1.2600.2549 6,656 Cstupd1394sidspeed.dll 04-Nov-2004 19:33 5.1.2600.2549 61,184 Ohci1394.sys