Windows Hardware Compatibility Audio Test causes computer to stop responding

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Article ID: 810272 - View products that this article applies to.
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When you run the Driver Verifier test in the Microsoft Windows Hardware Compatibility Test (HCT) version 11.0 kit to test audio drivers in Windows XP, your computer may stop responding (hang). A memory dump analysis may show debug information that is similar to the following:
FOLLOWUP_IP: portcls!CPortPinDMus::Init+4cb
bae0df0e 894508 mov [ebp+0x8],eax
SYMBOL_NAME: portcls!CPortPinDMus::Init+4cb
MODULE_NAME: portcls
IMAGE_NAME: portcls.sys
BUCKET_ID: 0x0_portcls!CPortPinDMus::Init+4cb


The following file is available for download from the Microsoft Download Center:
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Download the Q810272_WXP_SP2_x86_ENU.exe package now. For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
The English-language version of this fix should have the following file attributes or later:
   Windows XP Professional and Windows XP Home Edition: 

   Date         Time   Version        Size    File name
   12-Nov-2002  20:08  5.1.2600.106   50,176  Dmusic.sys (pre-SP1)
   12-Nov-2002  21:00  5.1.2600.1142  50,176  Dmusic.sys (with SP1)

   Windows XP 64-bit Edition: 

   Date         Time   Version        Size     File name
   12-Nov-2002  20:08  5.1.2600.106   144,768  Dmusic.sys (pre-SP1)
   12-Nov-2002  21:00  5.1.2600.1142  144,768  Dmusic.sys (with SP1)


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.


The Windows HCT 11.0 kit includes the tests, test documentation, and submission processes that you must use to participate in the Microsoft Windows Logo Program for Hardware for Microsoft Windows XP Professional Service Pack 1 (SP1). For more information about the Windows HCT 11.0 kit, visit the following Microsoft Web site:
For more information about the Windows Logo Program for Hardware, visit the following Microsoft Windows Hardware Quality Lab (WHQL) Web site:


Article ID: 810272 - Last Review: May 9, 2007 - Revision: 4.8
  • Microsoft Windows XP Professional
  • Microsoft Windows XP Professional SP1
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