Introduction

This article introduces an update that improves battery life for Low Power Audio Playback in Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2.

On a Windows RT 8.1, Windows 8.1, Windows Server 2012 R2-based computer, if you use a Bluetooth device that uses Advanced Audio Distribution Profile (A2DP) for Low Power Audio Playback, the power consumption is higher than expected.

Note The A2DP profile defines procedures and protocols for sending high quality audio data to peer Bluetooth devices.

More Information

To resolve this issue in Windows 8.1 or Windows Server 2012 R2, install update rollup 2903939, or install the hotfix that is described in this article. To resolve this issue in Windows RT 8.1, install update rollup 2903939.

Update information

For more information about how to obtain update rollup 2903939, click the following article number to view the article in the Microsoft Knowledge Base:

2903939 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: December 2013

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 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.

PrerequisitesTo apply this hotfix, you must be running Windows 8.1 or Windows Server 2012 R2.

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

Restart requirementYou must restart the computer after you apply this hotfix.

Hotfix replacement informationThis 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 8.1 and Windows Server 2012 R2 file information notesImportant Windows 8.1 hotfixes and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows 8.1" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1" 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

    6.3.960 0.16 xxx

    Windows RT 8.1, Windows 8.1 and Windows Server 2012 R2

    RTM

    GDR

  • 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 8.1 and Windows Server 2012 R2" 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 8.1

File name

File version

File size

Date

Time

Platform

Sercx2.sys

6.3.9600.16444

120,152

26-Oct-2013

20:28

x86

For all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File name

File version

File size

Date

Time

Platform

Sercx2.sys

6.3.9600.16444

146,776

26-Oct-2013

01:54

x64




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 for Windows 8.1 and Windows Server 2012 R2

Additional files for all supported x86-based versions of Windows 8.1

File property

Value

File name

X86_bf6759747a9bc5484953aa0268fe6a65_31bf3856ad364e35_6.3.9600.16444_none_39093c1aff912b8b.manifest

File version

Not applicable

File size

712

Date (UTC)

27-Oct-2013

Time (UTC)

08:54

File name

X86_microsoft-windows-s..l-classextension-v2_31bf3856ad364e35_6.3.9600.16444_none_d2ac880a854ca8fe.manifest

File version

Not applicable

File size

34,497

Date (UTC)

26-Oct-2013

Time (UTC)

20:39

Additional files for all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2

File property

Value

File name

Amd64_8db346eb27a612ae4a942da529b509e1_31bf3856ad364e35_6.3.9600.16444_none_acebb8f19cd6a740.manifest

File version

Not applicable

File size

716

Date (UTC)

27-Oct-2013

Time (UTC)

08:55

File name

Amd64_microsoft-windows-s..l-classextension-v2_31bf3856ad364e35_6.3.9600.16444_none_2ecb238e3daa1a34.manifest

File version

Not applicable

File size

34,501

Date (UTC)

26-Oct-2013

Time (UTC)

09:04


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