Version 1.0a of the Universal Audio Architecture (UAA) High Definition Audio class driver for Microsoft Windows has been released. This release supports the High Definition Audio and Modem implementations that are known to Microsoft as of August 1, 2004. This is the second version of this driver.

Version 1.0a of the UAA High Definition Audio class driver does not work on High Definition Audio implementations that were disclosed to Microsoft after August 1, 2004.

You must uninstall version 1.0 of the UAA High Definition Audio class driver before you install version 1.0a. For more information about version 1.0 of the UAA High Definition Audio class driver, click the following article number to view the article in the Microsoft Knowledge Base:

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Update information

A supported driver that modifies the product's default behavior is now available from Microsoft, but it is only intended to modify the behavior that this article describes. Apply it only to systems that specifically require it. This driver may receive additional testing. Therefore, if the system is not severely affected by the lack of this driver, we recommend that you wait for the next service pack that contains this driver.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

Prerequisites

This driver is designed to work with the following operating systems:

•	The original release version of Microsoft Windows Server 2003 Note This driver does not work with Windows Server 2003 Service Pack 1 or a later service pack.
•	Microsoft Windows XP with Service Pack 1 (SP1) or with Service Pack 2 (SP2)
•	Microsoft Windows 2000 with Service Pack 4 (SP4)

Restart requirement

You may have to restart your computer after you apply this update if the operating system components that this update replaces are being used when you install the update.

File information

The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Server 2003, original release version

File name	File version	File size	Date	Time	Platform
Hdaprop.dll	5.10.1.5013	25,088	08-Jan-2005	01:07	x86
Hdashcut.exe	5.10.1.5013	61,952	08-Jan-2005	01:07	x86
Hdaudbus.sys	5.10.1.5013	138,752	08-Jan-2005	01:07	x86
Hdaudio.sys	5.10.1.5013	145,920	08-Jan-2005	01:07	x86
Hdaudres.dll	5.10.1.5013	5,120	08-Jan-2005	01:07	x86
Mssap.dll	9.0.0.3140	147,456	08-Jan-2005	01:06	x86
Portcls.sys	5.2.3790.141	146,432	15-Mar-2004	20:44	x86

Windows XP with Service Pack 1 (SP1)

File name	File version	File size	Date	Time	Platform
Hdaprop.dll	5.10.1.5013	25,088	08-Jan-2005	01:07	x86
Hdashcut.exe	5.10.1.5013	61,952	08-Jan-2005	01:07	x86
Hdaudbus.sys	5.10.1.5013	138,752	08-Jan-2005	01:07	x86
Hdaudio.sys	5.10.1.5013	145,920	08-Jan-2005	01:07	x86
Hdaudres.dll	5.10.1.5013	5,120	08-Jan-2005	01:07	x86
Mssap.dll	9.0.0.3140	134,144	08-Jan-2005	01:06	x86
Portcls.sys	5.1.2600.1364	136,960	16-Mar-2004	18:58	x86

Windows XP with Service Pack 2 (SP2)

File name	File version	File size	Date	Time	Platform
Hdaprop.dll	5.10.1.5013	25,088	08-Jan-2005	01:07	x86
Hdashcut.exe	5.10.1.5013	61,952	08-Jan-2005	01:07	x86
Hdaudbus.sys	5.10.1.5013	138,752	08-Jan-2005	01:07	x86
Hdaudio.sys	5.10.1.5013	145,920	08-Jan-2005	01:07	x86
Hdaudres.dll	5.10.1.5013	5,120	08-Jan-2005	01:07	x86
Portcls.sys	5.1.2600.1364	136,960	16-Mar-2004	18:58	x86

Windows 2000 with Service Pack 4 (SP4)

File name	File version	File size	Date	Time	Platform
Hdaprop.dll	5.10.1.5013	25,088	08-Jan-2005	01:07	x86
Hdashcut.exe	5.10.1.5013	61,952	08-Jan-2005	01:07	x86
Hdaudbus.sys	5.10.1.5013	138,752	08-Jan-2005	01:07	x86
Hdaudio.sys	5.10.1.5013	145,920	08-Jan-2005	01:07	x86
Hdaudres.dll	5.10.1.5013	5,120	08-Jan-2005	01:07	x86
Portcls.sys	5.0.2195.6906	148,368	15-Mar-2004	18:20	x86
Sysaudio.sys	5.0.2195.6906	46,032	15-Mar-2004	19:19	x86

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Notes

UAA describes a class driver initiative for computer audio solutions that are supported in Microsoft Windows operating systems.

An audio device that is UAA-compliant can rely on the operating system for driver support. Therefore, hardware vendors do not have to supply a custom driver for a device.

A High Definition Audio device complies with the Intel High Definition Audio specification. A High Definition Audio device connects to the PCI bus or to the PCI Express bus. A High Definition Audio device can reside on an internal audio card, or the device can be part of an integrated motherboard chip set.

In the spring of 2004, Intel Corporation released the first hardware that includes High Definition Audio-compliant solutions. The update that is described in this article supports the Intel High Definition Audio-compliant hardware.

The audio industry solution that has been used in the past is the AC’97 Audio codec. UAA includes the following improvements for users, OEMs, and hardware manufacturers.

Improvements for users

•	Easier installation of audio peripherals
•	Easier installation of audio drivers
•	Better system stability
•	Better performance
•	Glitch-free audio
•	Improved security of the content that you want to help protect
•	Fewer vendor-supplied drivers
•	Less need to upgrade drivers
•	Guaranteed basic audio support for UAA-compliant devices

Improvements for OEMs and hardware manufacturers

•	Less software development, testing, and support
•	Less exposure to product support calls and to product returns
•	Easier phase-out of products that are at the "end of life"

If you install, remove, and then re-install this update, the update is no longer listed in Add or Remove Programs in Control Panel. Therefore, you cannot remove this update from your computer. To work around this problem, follow these steps.

Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

1.	Click Start, click Run, type regedit in the Open box, and then click OK.
2.	Locate and then click the following subkey in the registry: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Updates\Windows XP\SP3\KB888111
3.	On the Edit menu, click Delete.
4.	Click Yes, and then exit Registry Editor.

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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For more information about the standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:

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