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After you resume a Windows Vista-based computer from sleep or from hibernation, and then you restart the computer, 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. This problem occurs even though you have installed update 929685.

For more information about update 929685, 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 sleep or from hibernation and then restart the computer

Consider the following scenario. On a computer that is running Windows Vista, you open the Sound item in Control Panel. Then, you open the Properties dialog box for an installed device that uses one of the following interface formats:

• High-Definition Multimedia Interface (HDMI)
• Sony/Philips Digital Interface (S/PDIF)

However, when you click the Supported Formats tab in the Properties dialog box for the device, you notice that all the check boxes are unexpectedly selected. For example, the following check boxes are selected:

• DTS Audio
• Dolby Digital
• Microsoft WMA Audio
• 44.1 KHz
• 48.0 KHz
• 88.2 KHz
• 96.0 KHz
• 176.4 KHz
• 192.0 KHz

You experience this problem even though the following conditions are true:

• You did not select all the check boxes.
• The device does not support all these selected formats.

When this problem occurs, you may not receive sound from the device.

You play a Microsoft Windows Media High Definition Video (WMV HD) DVD or a WMV HD file in Windows Media Center in Windows Vista. However, the video may not be synchronized with the audio. This problem may occur if the following conditions are true:

• You pressed the Fast Forward button multiple times on the Media Center remote to fast forward the video at high speed.
• You pressed the Play button to return the video to regular playback speed.

When this problem occurs, the audio plays at the new location. However, the video is not synchronized with the audio for a while. Eventually, the video catches up to the audio.

Additionally, if you previously installed the 932757 hotfix to resolve this problem, you may experience the following problem:

• When you play a WMV HD DVD or a WMV HD file in Windows Media Center, you click Pause, you click Skip Forward several times, and then you click Fast Forward, you may receive an error message that resembles the following:
  

  The file is not available for playback

A handle leak in Lsm.exe may occur every time that Windows Media Player 11 plays an audio file in Windows Vista.

For example, if you leave Windows Media Player playing for a long time with the Repeat feature on, many handles may be leaked. These handles are leaked every time that Windows Media Player plays a song. In this scenario, the leaked handle count may grow to a large number, and the computer may become slow and unresponsive.

The problem occurs only when the computer is using a High Definition (HD) audio device. You must restart the computer to reclaim the leaked handles.

When you play a Microsoft Windows Media High Definition Video (WMV HD) DVD or a WMV HD file in Windows Media Center in Windows Vista, the video may not be synchronized with the audio.

This problem may occur if the following conditions are true:

• You pressed the Fast Forward button multiple times on the Media Center remote to fast forward the video at high speed.
• You pressed the Play button to return the video to regular playback speed.

When this problem occurs, the audio plays at the new location. However, the video is not synchronized with the audio for a while. Eventually, the video catches up to the audio.

A High Definition (HD) audio device may not play audio files after you update the BIOS on a Windows Vista-based computer.