Audio devices are missing or are displayed as "Not plugged in" after you restart a the computer that is running Windows 7 or Windows Server 2008 R2

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Article ID: 975538 - View products that this article applies to.
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Symptoms

You have a computer that is running Windows 7 or Windows Server 2008 R2. You connect an audio device to an HDMI endpoint on this computer. At first, the audio device works correctly. However, after you restart the computer, you cannot hear any sound from the audio device. Additionally, in the Sound window, the status of the corresponding audio device is "Not plugged in."

This problem occurs occasionally. It is more likely to occur on certain hardware.

Cause

This problem occurs because of a timing issue during audio initialization.

Resolution

Hotfix information

A supported hotfix is 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 the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language. A supported hotfix is 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.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, your computer must be running one of the following Windows operating systems:
  • Windows 7
  • Windows Server 2008 R2

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 and Windows Server 2008 R2 hotfixes are included in the same packages. However, only one of these products may be listed on the "Hotfix Request" page. To request the hotfix package that applies to both Windows 7 and Windows Server 2008 R2, just select the product that is listed on the page.
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2 and for Windows 7" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Audiodg.exe6.1.7600.16385100,86414-Jul-200901:14x86
Audioeng.dll6.1.7600.20572374,78411-Nov-200908:02x86
Audiokse.dll6.1.7600.20572442,88011-Nov-200908:02x86
Audioses.dll6.1.7600.16385195,58414-Jul-200901:14x86
Audiosrv.dll6.1.7600.20572473,08811-Nov-200908:02x86
Encdump.dll5.0.1.1274,94414-Jul-200901:15x86
Prod_audio-audiocore.ptxmlNot Applicable1,44213-Jul-200921:00Not Applicable
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Audiodg.exe6.1.7600.16385126,46414-Jul-200901:38x64
Audioeng.dll6.1.7600.16385440,83214-Jul-200901:40x64
Audiokse.dll6.1.7600.20572499,71211-Nov-200908:31x64
Audioses.dll6.1.7600.16385296,44814-Jul-200901:40x64
Audiosrv.dll6.1.7600.20572677,37611-Nov-200908:27x64
Encdump.dll5.0.1.1283,64814-Jul-200901:40x64
Prod_audio-audiocore.ptxmlNot Applicable1,44213-Jul-200920:47Not Applicable
Audioeng.dll6.1.7600.20572374,78411-Nov-200908:02x86
Audiokse.dll6.1.7600.20572442,88011-Nov-200908:02x86
Audioses.dll6.1.7600.20572195,58411-Nov-200908:02x86
Prod_wow64_audio-audiocore.ptxmlNot Applicable1,44211-Nov-200901:14Not Applicable

Workaround

To work around this problem, restart the Windows Audio Endpoint Builder service.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More information

For more information about software update terminology, 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

Additional file information

Additional file information for Windows 7 and for Windows Server 2008 R2

Additional files for all supported x86-based versions of Windows 7
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Package_1_for_kb975538~31bf3856ad364e35~x86~~6.1.1.0.mumNot Applicable1,82611-Nov-200910:44Not Applicable
Package_for_kb975538_rtm~31bf3856ad364e35~x86~~6.1.1.0.mumNot Applicable1,45811-Nov-200910:44Not Applicable
X86_7ebd3a2cccb008bebfeb85bd625e1573_31bf3856ad364e35_6.1.7600.20572_none_6ab662d9fd41d16d.manifestNot Applicable70311-Nov-200910:44Not Applicable
X86_microsoft-windows-audio-audiocore_31bf3856ad364e35_6.1.7600.20572_none_770788095f0b8a46.manifestNot Applicable88,77411-Nov-200910:50Not Applicable
Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Amd64_8fb1f6fb7ec9d3a0118706d390989e90_31bf3856ad364e35_6.1.7600.20572_none_a62e91266877e6e9.manifestNot Applicable1,05611-Nov-200910:44Not Applicable
Amd64_microsoft-windows-audio-audiocore_31bf3856ad364e35_6.1.7600.20572_none_d326238d1768fb7c.manifestNot Applicable88,77811-Nov-200910:44Not Applicable
Package_1_for_kb975538~31bf3856ad364e35~amd64~~6.1.1.0.mumNot Applicable2,05911-Nov-200910:44Not Applicable
Package_for_kb975538_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mumNot Applicable1,46611-Nov-200910:44Not Applicable
Wow64_microsoft-windows-audio-audiocore_31bf3856ad364e35_6.1.7600.20572_none_dd7acddf4bc9bd77.manifestNot Applicable75,37711-Nov-200908:16Not Applicable

Properties

Article ID: 975538 - Last Review: May 22, 2013 - Revision: 2.0
Applies to
  • Windows Server 2008 Datacenter without Hyper-V
  • Windows Server 2008 Enterprise without Hyper-V
  • Windows Server 2008 Standard without Hyper-V
  • Windows Server 2008 Datacenter
  • Windows Server 2008 Enterprise
  • Windows Server 2008 Standard
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Release Candidate
  • Windows 7 Starter
  • Windows 7 Ultimate
Keywords: 
kbsurveynew kbexpertiseinter kbexpertisebeginner kbqfe kbautohotfix kbhotfixserver KB975538

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