On a computer that runs Windows Vista or Windows Server 2008, you have a High-Definition Multimedia Interface (HDMI) device that is connected. However, the Sound dialog box in Control Panel may display duplicate items for the same device, or the Sound dialog box may not display any items for the device.

This problem occurs in one of the following scenarios:

  • You resume the computer from sleep or from hibernation.
  • You toggle between the laptop screen and an HDMI TV screen.

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