USB camera waits 8 seconds before it restarts video capture on a Windows XP-based computer that resumes from standby (905816)


The information in this article applies to:

  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Media Center Edition
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Tablet PC Edition
  • Microsoft Windows XP Tablet PC Edition 2005

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.

RESOLUTION

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 hotfix. For a complete list of Microsoft Product Support Services telephone 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.

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 "Applies to" section.

MORE INFORMATION

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

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\usbcamd

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

Modification Type:MinorLast Reviewed:7/24/2006
Keywords:kbQFE kbHotfixServer kbfix kbpubtypekc KB905816 kbAudDeveloper kbAudITPRO kbAudOEM
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