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Update that improves battery life when you play music through a Bluetooth device in Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2

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

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 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: 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 8.1 or Windows Server 2012 R2.

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 8.1 and Windows Server 2012 R2 file information notes
Important 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:
    VersionProductMilestoneService branch
    6.3.960 0.16 xxxWindows RT 8.1, Windows 8.1 and Windows Server 2012 R2RTMGDR
  • 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 nameFile versionFile sizeDateTimePlatform
Sercx2.sys6.3.9600.16444120,15226-Oct-201320:28x86
For all supported x64-based versions of Windows 8.1 and of Windows Server 2012 R2
File nameFile versionFile sizeDateTimePlatform
Sercx2.sys6.3.9600.16444146,77626-Oct-201301:54x64


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 8.1 and Windows Server 2012 R2

Additional files for all supported x86-based versions of Windows 8.1
File propertyValue
File nameX86_bf6759747a9bc5484953aa0268fe6a65_31bf3856ad364e35_6.3.9600.16444_none_39093c1aff912b8b.manifest
File versionNot applicable
File size712
Date (UTC)27-Oct-2013
Time (UTC)08:54
File nameX86_microsoft-windows-s..l-classextension-v2_31bf3856ad364e35_6.3.9600.16444_none_d2ac880a854ca8fe.manifest
File versionNot applicable
File size34,497
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 propertyValue
File nameAmd64_8db346eb27a612ae4a942da529b509e1_31bf3856ad364e35_6.3.9600.16444_none_acebb8f19cd6a740.manifest
File versionNot applicable
File size716
Date (UTC)27-Oct-2013
Time (UTC)08:55
File nameAmd64_microsoft-windows-s..l-classextension-v2_31bf3856ad364e35_6.3.9600.16444_none_2ecb238e3daa1a34.manifest
File versionNot applicable
File size34,501
Date (UTC)26-Oct-2013
Time (UTC)09:04
Properties

Article ID: 2903926 - Last Review: 12/12/2013 03:11:00 - Revision: 1.0

  • Windows 8.1
  • Windows 8.1 Enterprise
  • Windows 8.1 Pro
  • Windows Server 2012 R2 Datacenter
  • Windows Server 2012 R2 Essentials
  • Windows Server 2012 R2 Foundation
  • Windows Server 2012 R2 Standard
  • Windows RT 8.1
  • kbautohotfix kbqfe kbhotfixserver kbfix kbsurveynew kbexpertiseadvanced KB2903926
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