A high definition audio (HDA) device may no longer work after you resume a Windows Vista-based computer from hibernation or from sleep. The HDA device may be a sound device or a modem. You may see an "X" character appear on the speaker icon in the notification area.

Because of this problem, you no longer hear any sound. Or, you cannot use the modem. This problem occurs even though you have installed the update that is described in Microsoft Knowledge Base article 929685. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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This article contains an updated version of the updates that are described in Microsoft Knowledge Base articles 929685 and 934237. If you have installed either of the previous updates, and if the problem still occurs, we recommend that you install this update.

To resolve this problem, install update 937077. To install this update, visit the following Microsoft Web site:

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Update information

The following files are available for download from the Microsoft Download Center:

Windows Vista

Download the 937077 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=F8465BFD-F4C0-4650-A54E-3F87F6E5A25E)

Windows Vista for x64-based systems

Download the 937077 package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=C76C3B58-B89B-4525-B728-506950D7E8E5)

Release Date: June 26, 2007

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base: Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Prerequisites

No prerequisites are required.

Restart requirement

You must restart the computer after you install this update.

Update replacement information

This update replaces the following previously-released updates:

File information

The English version of this hotfix 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 Vista, x86-based versions

File name	File version	File size	Date	Time	Platform
Hdaudbus.sys	6.0.6000.16386	53,760	05-May-2007	00:37	x86
Update-bf.mum	Not Applicable	1,984	07-May-2007	17:56	Not Applicable
Update.mum	Not Applicable	2,727	07-May-2007	17:54	Not Applicable
X86_hdaudbus.inf_31bf3856ad364e35_6.0.6000.16481_none_74e5d15989a08e89.manifest	Not Applicable	1,689	07-May-2007	17:56	Not Applicable
X86_hdaudbus.inf_31bf3856ad364e35_6.0.6000.20592_none_75659e82a2c5639b.manifest	Not Applicable	1,689	07-May-2007	17:56	Not Applicable
Hdaudbus.sys	6.0.6000.16386	53,760	04-May-2007	00:31	x86

Windows Vista, 64-bit versions

File name	File version	File size	Date	Time	Platform
Amd64_hdaudbus.inf_31bf3856ad364e35_6.0.6000.16481_none_d1046cdd41fdffbf.manifest	Not Applicable	1,691	07-May-2007	18:02	Not Applicable
Amd64_hdaudbus.inf_31bf3856ad364e35_6.0.6000.20592_none_d1843a065b22d4d1.manifest	Not Applicable	1,691	07-May-2007	18:02	Not Applicable
Hdaudbus.sys	6.0.6000.16386	50,688	27-Mar-2007	22:13	x64
Update-bf.mum	Not Applicable	1,984	07-May-2007	17:56	Not Applicable
Update.mum	Not Applicable	2,727	07-May-2007	17:54	Not Applicable
Hdaudbus.sys	6.0.6000.16386	50,688	20-Apr-2007	22:52	x64

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For more information, click the following article number to view the article in the Microsoft Knowledge Base:

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