An USB device may intermittently disconnect and reconnect when you use the USB device in Windows 7 or in Windows Server 2008 R2

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Symptoms

Consider the following scenario:

  • You have a computer that has multiple processors and that is running Windows 7 or Windows Server 2008 R2.

  • You use an USB device on the computer.

In this scenario, the USB device intermittently disconnects and then reconnects. When this problem occurs, the USB device is re-enumerated.

Note If the device is a USB wireless networking device, the network connection is dropped and then reconnected.

Cause

This occurs because of a race condition in the USB driver when the operating system concurrently processes a request to resume from selective suspend and a request to disable wake on device connect. When the issue occurs, an unexpected USB bus reset is sent to the USB device driver. This causes the device to be removed and therefore a new device arrival notification and reinitialization occurs for the device. During this time, the USB device may disappear and reappear.

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 that is 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

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

Registry information

You do not have to make any changes to the registry to use this hotfix.

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 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 files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.1.760
    0.16xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    GDR

    6.1.760
    0.20xxx

    Windows 7 and Windows Server 2008 R2

    RTM

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, very important issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • 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 very important 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

File name

File version

File size

Date

Time

Platform

Usbehci.sys

6.1.7600.16701

42,496

10-Nov-2010

04:00

x86

Usbhub.sys

6.1.7600.16701

258,560

10-Nov-2010

04:01

x86

Usbport.sys

6.1.7600.16701

284,160

10-Nov-2010

04:00

x86

Usbehci.sys

6.1.7600.20834

42,496

10-Nov-2010

04:00

x86

Usbhub.sys

6.1.7600.20834

258,560

10-Nov-2010

04:01

x86

Usbport.sys

6.1.7600.20834

284,160

10-Nov-2010

04:00

x86

Usbehci.sys

6.1.7600.16701

42,496

10-Nov-2010

04:00

x86

Usbhub.sys

6.1.7600.16701

258,560

10-Nov-2010

04:01

x86

Usbport.sys

6.1.7600.16701

284,160

10-Nov-2010

04:00

x86

Usbehci.sys

6.1.7600.20834

42,496

10-Nov-2010

04:00

x86

Usbhub.sys

6.1.7600.20834

258,560

10-Nov-2010

04:01

x86

Usbport.sys

6.1.7600.20834

284,160

10-Nov-2010

04:00

x86

For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Usbehci.sys

6.1.7600.16701

52,224

10-Nov-2010

04:22

x64

Usbhub.sys

6.1.7600.16701

343,040

10-Nov-2010

04:23

x64

Usbport.sys

6.1.7600.16701

324,608

10-Nov-2010

04:22

x64

Usbehci.sys

6.1.7600.20834

52,224

10-Nov-2010

04:35

x64

Usbhub.sys

6.1.7600.20834

343,040

10-Nov-2010

04:36

x64

Usbport.sys

6.1.7600.20834

324,608

10-Nov-2010

04:35

x64

Usbehci.sys

6.1.7600.16701

52,224

10-Nov-2010

04:22

x64

Usbhub.sys

6.1.7600.16701

343,040

10-Nov-2010

04:23

x64

Usbport.sys

6.1.7600.16701

324,608

10-Nov-2010

04:22

x64

Usbehci.sys

6.1.7600.20834

52,224

10-Nov-2010

04:35

x64

Usbhub.sys

6.1.7600.20834

343,040

10-Nov-2010

04:36

x64

Usbport.sys

6.1.7600.20834

324,608

10-Nov-2010

04:35

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Usbehci.sys

6.1.7600.16701

132,096

10-Nov-2010

03:45

IA-64

Usbhub.sys

6.1.7600.16701

972,800

10-Nov-2010

03:46

IA-64

Usbport.sys

6.1.7600.16701

648,192

10-Nov-2010

03:45

IA-64

Usbehci.sys

6.1.7600.20834

132,096

10-Nov-2010

03:46

IA-64

Usbhub.sys

6.1.7600.20834

972,800

10-Nov-2010

03:47

IA-64

Usbport.sys

6.1.7600.20834

648,192

10-Nov-2010

03:46

IA-64

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 selective suspend in USB drivers, visit the following Microsoft website:

Selective Suspend in USB DriversFor 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

File name

Update-bf.mum

File version

Not applicable

File size

1,765

Date (UTC)

10-Nov-2010

Time (UTC)

21:51

Platform

Not applicable

File name

X86_embedded-usbport.inf_31bf3856ad364e35_6.1.7600.16701_none_1c8dc2e1786aa8a4.manifest

File version

Not applicable

File size

5,259

Date (UTC)

10-Nov-2010

Time (UTC)

21:53

Platform

Not applicable

File name

X86_embedded-usbport.inf_31bf3856ad364e35_6.1.7600.20834_none_1cf9f0c6919de846.manifest

File version

Not applicable

File size

5,259

Date (UTC)

10-Nov-2010

Time (UTC)

21:53

Platform

Not applicable

File name

X86_usbport.inf_31bf3856ad364e35_6.1.7600.16701_none_bdeb3b6664a3e67f.manifest

File version

Not applicable

File size

5,540

Date (UTC)

10-Nov-2010

Time (UTC)

21:53

Platform

Not applicable

File name

X86_usbport.inf_31bf3856ad364e35_6.1.7600.20834_none_be57694b7dd72621.manifest

File version

Not applicable

File size

5,540

Date (UTC)

10-Nov-2010

Time (UTC)

21:53

Platform

Not applicable

Additional files for all supported x64-based versions of Windows 7 and of Windows Server 2008 R2

File name

Amd64_embedded-usbport.inf_31bf3856ad364e35_6.1.7600.16701_none_78ac5e6530c819da.manifest

File version

Not applicable

File size

5,263

Date (UTC)

10-Nov-2010

Time (UTC)

21:56

Platform

Not applicable

File name

Amd64_embedded-usbport.inf_31bf3856ad364e35_6.1.7600.20834_none_79188c4a49fb597c.manifest

File version

Not applicable

File size

5,263

Date (UTC)

10-Nov-2010

Time (UTC)

21:56

Platform

Not applicable

File name

Amd64_usbport.inf_31bf3856ad364e35_6.1.7600.16701_none_1a09d6ea1d0157b5.manifest

File version

Not applicable

File size

5,544

Date (UTC)

10-Nov-2010

Time (UTC)

21:56

Platform

Not applicable

File name

Amd64_usbport.inf_31bf3856ad364e35_6.1.7600.20834_none_1a7604cf36349757.manifest

File version

Not applicable

File size

5,544

Date (UTC)

10-Nov-2010

Time (UTC)

21:56

Platform

Not applicable

File name

Update-bf.mum

File version

Not applicable

File size

1,777

Date (UTC)

10-Nov-2010

Time (UTC)

21:51

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_usbport.inf_31bf3856ad364e35_6.1.7600.16701_none_bdecdf5c64a1ef7b.manifest

File version

Not applicable

File size

5,542

Date (UTC)

10-Nov-2010

Time (UTC)

21:51

Platform

Not applicable

File name

Ia64_usbport.inf_31bf3856ad364e35_6.1.7600.20834_none_be590d417dd52f1d.manifest

File version

Not applicable

File size

5,542

Date (UTC)

10-Nov-2010

Time (UTC)

21:51

Platform

Not applicable

File name

Update-bf.mum

File version

Not applicable

File size

1,429

Date (UTC)

10-Nov-2010

Time (UTC)

21:51

Platform

Not applicable

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