Microsoft KB Archive/905816

= USB camera waits 8 seconds before it restarts video capture on a Windows XP-based computer that resumes from standby =

Article ID: 905816

Article Last Modified on 8/29/2007

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APPLIES TO


 * Microsoft Windows XP Home Edition
 * Microsoft Windows XP Media Center Edition 2002
 * Microsoft Windows XP Professional
 * Microsoft Windows XP Tablet PC Edition
 * Microsoft Windows XP Tablet PC Edition 2005

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SYMPTOMS
Consider the following scenario:
 * You use a USB camera on a Microsoft Windows XP-based computer to capture video.
 * You put the computer on standby.
 * You resume the computer from standby.

In this scenario, the camera waits approximately 8 seconds before it restarts video capture.

Note The delay occurs only with USB cameras that use the USBCAMD device driver model.



CAUSE
The USBCAMD device driver waits 8 seconds before the driver enables the USB camera. Older devices require this delay to resume operation. Newer devices may not require this delay.



Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

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

Prerequisites
No prerequisites are required.

Restart requirement
You must restart the computer after you apply this hotfix.

File 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 11-Aug-2005 00:03  5.1.2600.2736      25,472  Usbcamd.sys   x86 11-Aug-2005 00:03  5.1.2600.2736      25,600  Usbcamd2.sys  x86



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
The PowerUpDelay registry entry controls the delay time. This entry is located in the following registry subkey:

The PowerUpDelay entry is created and modified by the OEM driver file.

Note PowerUpDelay is a registry DWORD value that is set in seconds. Both the USBCAMD and USBCAMD2 device drivers use this entry to determine delay time before the drivers enable the camera.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Keywords: kbqfe kbhotfixserver kbfix kbpubtypekc KB905816

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