You set a high definition (HD) audio controller not to wake a Windows Vista-based computer by using the Allow this Device to wake the Computer option in Windows Vista. However, the “wake on ring” (WOR) feature still wakes the computer from sleep and from hibernation.

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 output audio 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.

The information in this article applies to the following configuration(s):

• Radeon Xpress 1100 series
• Windows Vista 32-bit Edition
• Windows Vista 64-bit Edition
• Windows XP Professional
• Windows XP Home Edition
• Windows XP Media Center Edition
• Windows XP Professional x64 Edition

Symptoms:
The default audio device may be set to ATI HD Audio after installation of the display driver.

The information in this article applies to the following configuration(s):

• Radeonâ„¢ HD2400 series
• Windows Vista 32-bit Edition
• Windows Vista 64-bit Edition

Symptoms:
Dragging player window to secondary display while playing back HD content and moving it back to primary may result in blank player window.

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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:

929685 A high definition audio device may no longer work after you resume Windows Vista from hibernation or from sleep

Windows Vista includes a feature that enables a High Definition Audio controller to wake the computer from sleep or from hibernation.

Note: This feature consumes a very small amount of additional power while the computer is asleep or in hibernation.

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