The desktop stops responding for some time after you resume the display on a computer that is running Windows 7

Symptoms

Consider the following scenario:

  • You enable the Auto-hide the taskbar option on a computer that is running Windows 7. For more information about how to enable this option, see the "More information" section.

  • In Control Panel, you configure both of the following power options in the Power Options item:

    • You configure the computer to turn off the display after a specified time.

    • You configure the computer never to sleep.

  • You minimize or close all the windows on the desktop. There is no open window on the desktop.

  • After the display is turned off as configured, you resume the display.

In this scenario, the display turns on immediately. But the display does not respond to any mouse or keyboard input. Therefore, you experience one or more of the following issues:

  • When you move the mouse to the bottom of the screen, the taskbar does not appear.

  • When you press the windows key, the taskbar and the Start menu do not appear.

  • When you click or double-click any desktop icon, there is no response.

Note The display will recover and begin to respond after some time, depending on how long the display is turned off.

Cause

The issue occurs because the Desktop Window Manager (DWM) keeps accepting draw requests from the client applications even when the display is turned off. These requests are accumulated and then processed when the computer comes back from an idle state. This behavior causes the graphics processing unit (GPU) to become so busy that any display-related operation becomes unresponsive.

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 website:

http://support.microsoft.com/contactus/?ws=supportNote 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

There are no prerequisites for applying this hotfix.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

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 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 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 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

File name

File version

File size

Date

Time

Platform

Dwmapi.dll

6.1.7600.20800

67,072

17-Sep-2010

04:25

x86

Dwmcore.dll

6.1.7600.20800

1,370,624

17-Sep-2010

04:25

x86

For all supported x64-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Dwmapi.dll

6.1.7600.20800

82,432

17-Sep-2010

05:24

x64

Dwmcore.dll

6.1.7600.20800

1,633,792

17-Sep-2010

05:24

x64

Dwmapi.dll

6.1.7600.20800

67,072

17-Sep-2010

04:25

x86

Dwmcore.dll

6.1.7600.20800

1,370,624

17-Sep-2010

04:25

x86

Workaround

To work around this issue, use one of the following methods.

Method 1

In Control Panel, disable the Auto-hide the taskbar option in the Taskbar and Start Menu item.

Method 2

Do not turn off the display.

Method 3

Do not minimize or close all windows on the desktop. Keep at least one active window on the desktop.

Status

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

More Information

How to enable the "Auto-hide the taskbar" option

To enable the Auto-hide the taskbar option, follow these steps:

  1. Right-click Startstart , and then click Properties.

  2. Click the Taskbar tab.

  3. Click to select the Auto-hide the taskbar check box to enable this option.

  4. Click OK.

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

2005467 Windows 7 Desktop Temporarily Fails To Update After Resuming The MonitorFor 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

Additional files for all supported x86-based versions of Windows 7

File name

Update.mum

File version

Not applicable

File size

1,880

Date (UTC)

17-Sep-2010

Time (UTC)

07:55

Platform

Not applicable


File name

X86_acad75f8d8ff1a5709d3beeedc0a59c4_31bf3856ad364e35_6.1.7600.20800_none_28e2ad8f77ee3570.manifest

File version

Not applicable

File size

712

Date (UTC)

17-Sep-2010

Time (UTC)

07:55

Platform

Not applicable


File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7600.20800_none_e0c05d01ba322690.manifest

File version

Not applicable

File size

2,904

Date (UTC)

17-Sep-2010

Time (UTC)

05:10

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7

File name

Amd64_1664ce93955b295b23aac35ea03ff130_31bf3856ad364e35_6.1.7600.20800_none_4c485c368564c8e6.manifest

File version

Not applicable

File size

1,072

Date (UTC)

17-Sep-2010

Time (UTC)

07:55

Platform

Not applicable


File name

Amd64_a4cbe3a59ddde5b3b11d08ccd890f8af_31bf3856ad364e35_6.1.7600.20800_none_08ef35977e9df165.manifest

File version

Not applicable

File size

716

Date (UTC)

17-Sep-2010

Time (UTC)

07:55

Platform

Not applicable


File name

Amd64_acad75f8d8ff1a5709d3beeedc0a59c4_31bf3856ad364e35_6.1.7600.20800_none_85014913304ba6a6.manifest

File version

Not applicable

File size

714

Date (UTC)

17-Sep-2010

Time (UTC)

07:55

Platform

Not applicable


File name

Amd64_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7600.20800_none_3cdef885728f97c6.manifest

File version

Not applicable

File size

2,906

Date (UTC)

17-Sep-2010

Time (UTC)

06:02

Platform

Not applicable


File name

Update.mum

File version

Not applicable

File size

2,536

Date (UTC)

17-Sep-2010

Time (UTC)

07:55

Platform

Not applicable


File name

X86_microsoft-windows-d..opwindowmanager-api_31bf3856ad364e35_6.1.7600.20800_none_e0c05d01ba322690.manifest

File version

Not applicable

File size

2,904

Date (UTC)

17-Sep-2010

Time (UTC)

05:10

Platform

Not applicable

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