CAUSE
This problem occurs because a race condition exists in the Portcls.sys driver. This driver is a Windows Audio Class driver. A race scenario may occur when the following conditions are true:
- The Portcls.sys driver receives an IRP_MJ_DEVICE_CONTROL request after Windows resumes from hibernation.
- The Portcls.sys driver has not yet returned to the PowerDeviceD0 (D0) power state.
Note A device that is Advanced Configuration and Power Interface (ACPI) compliant has four power states. The D0 state represents the working power state. The D1 through D3 power states represent the sleeping power states.
In this scenario, the Portcls.sys driver may mark the control I/O request packet (IRP) as
STATUS_PENDING. However, it never completes the IRP. The upper-level components in the Audio stack that wait for this IRP to be completed block all additional audio requests. Therefore, audio files do not play after you resume Windows from hibernation.
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:
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 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
--------------------------------------------------------------
22-Mar-2005 03:43 5.1.2600.2637 145,920 Portcls.sys
25-Feb-2005 03:53 6.1.22.4 371,936 Updspapi.dll