The Sound dialog box displays duplicate items or no items for an HDMI device in Windows Vista or in Windows Server 2008
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.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB959458.