This article describes some issues that occur when the Hardware P-state (HWP) mode is enabled on a computer that is running Windows 8.1 or Windows Server 2012 R2. A hotfix is available to resolve this issue. The hotfix has a prerequisite.

Symptoms

Assume that you have an Intel Skylake (SKL)-based computer, you may encounter one of the following issues.

Issue 1

When you resume your computer from sleep or hibernate mode, the operating system crashes.

Issue 2

The operating system cannot change CPU frequency to reduce power consumption. Therefore, CPU always runs on the maximum possible frequency that may affect the device battery life and heat dissipation.

Resolution

To resolve this issue, we have released a hotfix that contains the Intelppm.sys file.

Note The Intelppm.sys file is the CPU driver of Skylake. There are other drivers in the same installation component with the Intelppm.sys file in this hotfix.

Hotfix information

Important Do not install a language pack after you install this hotfix. If you do, the language-specific changes in the hotfix will not be applied, and you will have to reinstall the hotfix. For more information, see Add language packs to Windows.

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.

Prerequisites

To apply this hotfix, you must have April 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 (2919355) installed in 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 may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

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 and notes

Important Windows 8.1 hotfixes and Windows Server 2012 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 8.1/Windows Server 2012 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

    6.3.960 0.17xxx

    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" section. MUM, MANIFEST, and the associated security catalog (.cat) files, are very 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

Amdk8.sys

6.3.9600.17723

85,504

08-Mar-2015

23:45

x86

Amdppm.sys

6.3.9600.17723

83,456

08-Mar-2015

23:45

x86

Fxppm.sys

6.3.9600.17723

22,016

08-Mar-2015

23:45

x86

Intelppm.sys

6.3.9600.17723

86,528

08-Mar-2015

23:45

x86

Processr.sys

6.3.9600.17723

82,944

08-Mar-2015

23:45

x86

Viac7.sys

6.3.9600.17723

83,456

08-Mar-2015

23:45

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

Amdk8.sys

6.3.9600.17723

95,744

08-Mar-2015

23:51

x64

Amdppm.sys

6.3.9600.17723

98,816

08-Mar-2015

23:51

x64

Fxppm.sys

6.3.9600.17723

27,136

08-Mar-2015

23:51

x64

Intelppm.sys

6.3.9600.17723

98,816

08-Mar-2015

23:51

x64

Processr.sys

6.3.9600.17723

92,160

08-Mar-2015

23:51

x64

Additional file information

Additional file information for Windows 8.1 and for Windows Server 2012 R2

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

File property

Value

File name

X86_cpu.inf_31bf3856ad364e35_6.3.9600.17723_none_f229ef340acb0231.manifest

File version

Not applicable

File size

5,253

Date (UTC)

09-Mar-2015

Time (UTC)

02:13

Platform

Not applicable

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

File property

Value

File name

Amd64_cpu.inf_31bf3856ad364e35_6.3.9600.17723_none_4e488ab7c3287367.manifest

File version

Not applicable

File size

4,626

Date (UTC)

09-Mar-2015

Time (UTC)

03:00

Platform

Not applicable

Status

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

References

See the terminology that Microsoft uses to describe software updates.

Third-party information disclaimer

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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