A portable computer display does not switch back to the internal monitor after you play a DVD on an external monitor and disconnect the HDMI cable in Windows 7

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Article ID: 981721 - View products that this article applies to.
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SYMPTOMS

Consider the following scenario:
  • You have a portable computer that is running Windows 7 or Windows Server 2008 R2.
  • You connect this portable computer to a digital TV by using an HDMI cable.
  • You set the display mode to the Projector only setting.
  • You play a copy-protected DVD in Windows Media Player or in Windows Media Center.
  • You disconnect the HDMI cable.
In this scenario, the monitor does not switch back to the internal display as expected. Instead, the monitor remains blank and you cannot see anything unless you plug the HDMI cable back into the portable computer or you restart the portable computer. This behavior may cause potential data loss.

Note This problem does not occur if you use a DVD that is not copy-protected. This problem seems to be related to copy protection.

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.

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 R2 or Windows 7 on your computer.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2 file information notes
Important Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • 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 extremely important to maintain the state of the updated components. 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
Cdd.dll6.1.7600.16385107,00814-Jul-200901:04x86
Dxgkrnl.sys6.1.7600.20674728,45620-Mar-201007:44x86
Dxgmms1.sys6.1.7600.16385211,96813-Jul-200923:25x86
Lddmcore.ptxmlNot Applicable1,15113-Jul-200920:32Not 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
Cdd.dll6.1.7600.16385143,87214-Jul-200901:25x64
Dxgkrnl.sys6.1.7600.20674982,40820-Mar-201008:01x64
Dxgmms1.sys6.1.7600.16385258,04813-Jul-200923:38x64
Lddmcore.ptxmlNot Applicable1,15113-Jul-200920:25Not Applicable
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Cdd.dll6.1.7600.16385347,13614-Jul-200901:33IA-64
Dxgkrnl.sys6.1.7600.206742,501,51220-Mar-201006:39IA-64
Dxgmms1.sys6.1.7600.16385663,04013-Jul-200923:45IA-64
Lddmcore.ptxmlNot Applicable1,15113-Jul-200920:25Not Applicable

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_for_kb981721_rtm~31bf3856ad364e35~x86~~6.1.1.0.mumNot Applicable1,45820-Mar-201011:33Not Applicable
X86_microsoft-windows-lddmcore_31bf3856ad364e35_6.1.7600.20674_none_ac325efb5df6bfbd.manifestNot Applicable13,30522-Mar-201000:28Not 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_microsoft-windows-lddmcore_31bf3856ad364e35_6.1.7600.20674_none_0850fa7f165430f3.manifestNot Applicable13,30922-Mar-201000:31Not Applicable
Package_for_kb981721_rtm~31bf3856ad364e35~amd64~~6.1.1.0.mumNot Applicable1,68820-Mar-201011:33Not Applicable
Additional files for all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTimePlatform
Ia64_microsoft-windows-lddmcore_31bf3856ad364e35_6.1.7600.20674_none_ac3402f15df4c8b9.manifestNot Applicable13,30722-Mar-201000:26Not Applicable
Package_for_kb981721_rtm~31bf3856ad364e35~ia64~~6.1.1.0.mumNot Applicable1,68320-Mar-201011:33Not Applicable

Properties

Article ID: 981721 - Last Review: October 9, 2011 - Revision: 3.0
APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows HPC Server 2008 R2
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 Standard
  • Windows Web Server 2008 R2
Keywords: 
kbqfe kbHotfixServer kbsurveynew kbautohotfix kbexpertisebeginner kbbug kbfix KB981721

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