This article describes a hotfix for Peripheral Component Interconnect (PCI) bus driver improvements in Windows 8.1 or Windows Server 2012 R2 to support Message Signaled Interrupts (MSI-X). The hotfix has a prerequisite.

Symptoms

Assume that you mount an MSI-X device to a computer that is running Windows 8.1 or Windows Server 2012 R2. In this situation, MSI-X is not enabled, and you are in the legacy interrupt mode.

Resolution

To resolve this issue, we have released a hotfix. Even though this issue is observed only in Windows 8.1 or Windows Server 2012 R2, the hotfix also applies to Windows RT 8.1.

Hotfix information

Important If you install a language pack after you install this hotfix, you must reinstall this hotfix. Therefore, we recommend that you install any language packs that you need before you install this 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 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" 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

Agp440.sys

6.3.9600.17901

55,640

10-Jun-2015

12:07

x86

Amdagp.sys

6.3.9600.17901

55,640

10-Jun-2015

12:07

x86

Isapnp.sys

6.3.9600.17901

47,960

10-Jun-2015

12:07

x86

Msisadrv.sys

6.3.9600.17901

15,192

10-Jun-2015

12:07

x86

Nv_agp.sys

6.3.9600.17901

107,352

10-Jun-2015

12:07

x86

Pci.sys

6.3.9600.17901

209,240

10-Jun-2015

12:07

x86

Sisagp.sys

6.3.9600.17901

54,104

10-Jun-2015

12:07

x86

Uliagpkx.sys

6.3.9600.17901

59,224

10-Jun-2015

12:07

x86

Viaagp.sys

6.3.9600.17901

56,152

10-Jun-2015

12:07

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

Agp440.sys

6.3.9600.17901

62,296

10-Jun-2015

12:02

x64

Isapnp.sys

6.3.9600.17901

21,848

10-Jun-2015

12:02

x64

Msisadrv.sys

6.3.9600.17901

17,240

10-Jun-2015

12:02

x64

Nv_agp.sys

6.3.9600.17901

124,760

10-Jun-2015

12:02

x64

Pci.sys

6.3.9600.17901

274,264

10-Jun-2015

12:02

x64

Uliagpkx.sys

6.3.9600.17901

65,880

10-Jun-2015

12:02

x64

For all supported Windows RT 8.1

File name

File version

File size

Date

Time

Platform

Pci.sys

6.3.9600.17901

189,280

10-Jun-2015

12:13

Not applicable

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_machine.inf_31bf3856ad364e35_6.3.9600.17901_none_4f0624e0da0c4bb6.manifest

File version

Not applicable

File size

7,171

Date (UTC)

10-Jun-2015

Time (UTC)

12:32

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_machine.inf_31bf3856ad364e35_6.3.9600.17901_none_ab24c0649269bcec.manifest

File version

Not applicable

File size

5,276

Date (UTC)

10-Jun-2015

Time (UTC)

12:35

Platform

Not applicable

Additional files for all supported Windows RT 8.1

File property

Value

File name

Arm_machine.inf_31bf3856ad364e35_6.3.9600.17901_none_4f089738da096a7c.manifest

File version

Not applicable

File size

2,099

Date (UTC)

10-Jun-2015

Time (UTC)

12:28

Platform

Not applicable

Status

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

References

See the terminology that Microsoft uses to describe software updates.

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