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External monitors go to sleep when docking station audio is unplugged

EliteBook 840 G2
Microsoft Windows 7 (64-bit)

This is really strange, but when laptop is docked and headphones are unplugged from docking station I'll get a message from DTS Audio application that says "you just unplugged an audio device" and then both of my HP Compaq LA2206x monitors will go to sleep.

 

The way to recover is remove laptop from docking station, open up to get display, then close and re-dock.

 

My display adapters are AMD Radeon R7 M260X and Intel(R) HD Graphics 5500. My sound device is Realtek HD Audio.

 

Is this an audio driver or display driver issue, or both?

 

thanks.

c

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