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.