Windows Vista does not enumerate an IEEE 1394a device that you connect to the computer

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Article ID: 927827 - View products that this article applies to.
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SYMPTOMS

When you connect an IEEE 1394a device to a computer that is running Windows Vista, Windows Vista does not enumerate the device. However, if you connect the same device to a computer that is running Microsoft Windows XP, Windows XP enumerates the device successfully.

Note An IEEE 1394a device may also be referred to as a FireWire device.

CAUSE

Windows Vista only enumerates a device that sets its link status to request enumeration. If an IEEE 1394a device does not report the correct status of its link, the IEEE 1394 stack in Windows Vista does not enumerate the device.

WORKAROUND

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows


To work around this problem, for non-compliant IEEE 1394a devices, configure Windows Vista to enumerate inactive IEEE 1394 devices. To do this, follow these steps:
  1. Click Start
    Collapse this imageExpand this image
    Start button
    , type regedit in the Start Search box, and then click regedit in the Programs list.

    Collapse this imageExpand this image
     User Account Control permission
    If you are prompted for an administrator password or confirmation, type your password or click Continue.
  2. Locate and then click the following registry subkey:
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{6BDD1FC1-810F-11D0-BEC7-08002BE2092F}\ControllerInstance
    In this path, ControllerInstance represents the controller instance number. For example, this number may be 0000.
  3. On the Edit menu, point to New, and then click DWORD (32-bit) Value.
  4. In the New Value #1 box, type EnumerateInactiveLink, and then press ENTER.
  5. Right-click EnumerateInactiveLink, and then click Modify.
  6. In the Value data box, type 1, and then click OK.
  7. Exit Registry Editor.

MORE INFORMATION

You may be able to obtain a firmware update for the IEEE 1394a device to resolve this problem. To determine whether a firmware update is available for the device, contact the device manufacturer or the device vendor.

For information about your hardware manufacturer, visit the following Web site:
http://support.microsoft.com/gp/vendors/en-us
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Properties

Article ID: 927827 - Last Review: March 15, 2007 - Revision: 1.7
APPLIES TO
  • Windows Vista Ultimate
  • Windows Vista Enterprise
  • Windows Vista Business
  • Windows Vista Home Premium
  • Windows Vista Home Basic
  • Windows Vista Starter
  • Windows Vista Enterprise 64-bit Edition
  • Windows Vista Home Basic 64-bit Edition
  • Windows Vista Home Premium 64-bit Edition
  • Windows Vista Ultimate 64-bit Edition
Keywords: 
kbexpertisebeginner kbhardware kbtshoot kbprb KB927827

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