Microsoft KB Archive/937378

= After you upgrade to Windows Vista, audio playback no longer works on the computer if the SigmaTel HD audio driver is installed =

Article ID: 937378

Article Last Modified on 9/4/2007

-

APPLIES TO


 * Windows Vista Ultimate
 * Windows Vista Ultimate 64-bit Edition
 * Windows Vista Enterprise
 * Windows Vista Enterprise 64-bit Edition
 * Windows Vista Business
 * Windows Vista Business 64-bit Edition
 * Windows Vista Home Premium
 * Windows Vista Home Premium 64-bit Edition
 * Windows Vista Home Basic
 * Windows Vista Home Basic 64-bit Edition

-



SYMPTOMS
Consider the following scenario:
 * You upgrade a computer to Windows Vista.
 * The computer uses a SigmaTel HD audio driver.

In this scenario, audio playback no longer works on the computer. Additionally, you receive the following message when you position the pointer over the speaker icon in the notification area:

No audio output device is installed.

This problem occurs even if all the audio cables are connected correctly, and the sound driver appears to be working correctly in Device Manager.

Note The notification area is located at the far right of the taskbar.



CAUSE
This problem occurs because of the proprietary way in which the SigmaTel unified driver supports custom OEM configurations. Instead of using different .inf files, SigmaTel uses an .ini file-referenced system that does not function correctly when you upgrade the computer to Windows Vista.



RESOLUTION
To resolve this problem, download the latest SigmaTel HD audio driver from your OEM support Web site, and then install this driver.



MORE INFORMATION
For information about how to contact SigmaTel, click the appropriate article number in the following list to view the article in the Microsoft Knowledge Base:

65416 Hardware and software vendor contact information, A-K

60781 Hardware and software vendor contact information, L-P

60782 Hardware and software vendor contact information, Q-Z

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information. 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.

Keywords: kbtshoot kbprb kbpubtypekc KB937378

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.