A high definition audio device may no longer work after you resume Windows Vista from hibernation or from sleep

After you resume a Windows Vista-based computer from sleep or from hibernation, a high definition audio (HDA) device may no longer work. The 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.

Note An updated version of this article and hotfix is now available. To resolve this problem using the latest updates from Microsoft, see the following article in the Microsoft Knowledge Base:

Service pack information

To resolve this problem, obtain the latest service pack for Windows Vista. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Update information

To resolve these problems, install update 937077.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Windows Vista Service Pack 1.