Microsoft KB Archive/330421

= FIX: Isoch Callback Not Called or Error on Blue Screen Occurs When Starting Isoch Stream =

Article ID: 330421

Article Last Modified on 2/12/2007

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APPLIES TO


 * Microsoft Windows 2000 Standard Edition
 * Microsoft Windows XP Professional

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This article was previously published under Q330421



SYMPTOMS
When you start the isoch stream, you may experience one of the following symptoms:
 * On Windows 2000, the isoch callback is not called.
 * On Windows XP, you receive an error on a blue screen.



CAUSE
The problem occurs because the whole isochronous transfer that is requested uses only one isochronous packet.

Under Windows 2000, you do not receive an error on a blue screen. However, the data that is received during the transfer is incorrect, or the driver stops responding because it never received an isoch callback to notify it that the direct memory access (DMA) transfer has been completed.

Under Windows XP, before the DMA transfer starts, during the construction of the DMA scatter/gather list, you receive an error on a blue screen.



Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

Hotfix Information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The P1 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     Platform -  03-Oct-2001 13:56   5.0.2195.4455  22,064  sonydcam.sys  Windows 2000 16-Oct-2002 19:40  5.0.2195.6092  37,680  ohci1394.sys  Windows 2000

17-Oct-2002 10:20  5.1.2600.103   55,424  ohci1394.sys  Windows XP SP1

17-Oct-2002 10:27  5.1.2600.1133  55,680  ohci1394.sys  Windows XP SP2



STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.

Keywords: kbbug kbfix kbqfe kboswin2000fix kbwin2ksp4fix kbhotfixserver KB330421

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