A Bluetooth Personal Area Network device may stop responding after a surprise removal of the device from a computer that is running Windows 7

Symptoms

Consider the following scenario:

  • You pair a Bluetooth Personal Area Network device to a computer that is running Windows 7.

  • You perform a surprise removal of the device.

  • You pair the device to the computer again, and the Bluetooth Personal Area Network device reinitializes.

In this scenario, the Bluetooth Personal Area Network device may stop responding. In Device Manager, you see a yellow exclamation point (!) displayed next to the Bluetooth Personal Area Network device.

Cause

This problem occurs because Bthport.sys does not process device I/O control requests that are queued while the device is in a stopped state correctly. When a device is removed, the driver should not be unloaded if an application is waiting for any device I/O control requests to complete. This prevents the driver from functioning when the Bluetooth radio is reconnected.

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=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.

Registry information

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

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 English (United States) 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, critical 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 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

Bthenum.sys

6.1.7600.16385

34,816

13-Jul-2009

23:51

x86

Bthport.sys

6.1.7600.20742

393,216

24-Jun-2010

08:05

x86

Bthusb.sys

6.1.7600.20742

60,416

24-Jun-2010

08:05

x86

Fsquirt.exe

6.1.7600.16385

219,648

14-Jul-2009

01:14

x86

For all supported x64-based versions of Windows 7

File name

File version

File size

Date

Time

Platform

Bthenum.sys

6.1.7600.16385

41,984

14-Jul-2009

00:06

x64

Bthport.sys

6.1.7600.20742

552,448

24-Jun-2010

09:47

x64

Bthusb.sys

6.1.7600.20742

80,384

24-Jun-2010

09:47

x64

Fsquirt.exe

6.1.7600.16385

229,376

14-Jul-2009

01:39

x64

Status

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

More Information

Bluetooth Personal Area Network (PAN) is a technology that enables you to create an Ethernet network with wireless links between mobile computers, mobile phones, and handheld devices. You can connect to the following types of Bluetooth enabled devices that work with PAN:

  • A personal area network user (PANU) device

  • A group ad hoc network (GN) device

  • A¬†network access point (NAP) device


For more information about PAN, visit the following Microsoft website:

What is a Bluetooth personal area network (PAN)?
For more information about the Bluetooth driver stack, visit the following Microsoft website:

Bluetooth driver stackFor 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

Package_1_for_kb2254251~31bf3856ad364e35~x86~~6.1.2.0.mum

File version

Not Applicable

File size

1,829

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Package_2_for_kb2254251~31bf3856ad364e35~x86~~6.1.2.0.mum

File version

Not Applicable

File size

1,803

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Package_for_kb2254251_rtm~31bf3856ad364e35~x86~~6.1.2.0.mum

File version

Not Applicable

File size

1,898

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,623

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

X86_bth.inf_31bf3856ad364e35_6.1.7600.20742_none_72ccfbae35e4a87c.manifest

File version

Not Applicable

File size

3,492

Date (UTC)

25-Jun-2010

Time (UTC)

00:09

Platform

Not Applicable

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

File name

Amd64_bth.inf_31bf3856ad364e35_6.1.7600.20742_none_ceeb9731ee4219b2.manifest

File version

Not Applicable

File size

3,496

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Package_1_for_kb2254251~31bf3856ad364e35~amd64~~6.1.2.0.mum

File version

Not Applicable

File size

1,839

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Package_2_for_kb2254251~31bf3856ad364e35~amd64~~6.1.2.0.mum

File version

Not Applicable

File size

1,813

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Package_for_kb2254251_rtm~31bf3856ad364e35~amd64~~6.1.2.0.mum

File version

Not Applicable

File size

1,910

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,633

Date (UTC)

25-Jun-2010

Time (UTC)

00:06

Platform

Not Applicable

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