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ITsVISTA KB-Link: KB2554573

The volume state may be briefly displayed on the screen every time a sound is played through the speakers of a DisplayPort or HDMI-connected external monitor

Consider the following scenario:

You have a Windows 7 or Vista PC that is connected to an external display using a DisplayPort or HDMI cable.
The external display has built-in speakers.
The display’s speakers are set as the default audio playback device in Windows.
You are running an on-screen display (OSD) application that displays the volume level or screen brightness state whenever there is a change in levels.

In this scenario you may notice that whenever audio is played through the external display’s speakers, the OSD application will appear for a couple of seconds and display the volume level. The expected behavior is that the application should only display the volume state when the volume is changed or muted.

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2554573.

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