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When logging off or shutting down, audio noise comes through my displayport to hdmi adapter HP t740

HP Recommended
HP t740
Microsoft Windows 10 IOT

When logging off or shutting down, horrible static video and audio noise comes through my monitor speakers.

I am using a Displayport to HDMI adapter to connect to my two monitors.

My system is an HP t740 thin client, running Win10 IoT Enterprise. I am using 2, 24" monitors with internal speakers.

The OS detects the monitor speakers by default. I have physically disconnected the internal speakers, the internal system speaker and only use the headset speaker/mic option.

Any suggestions would be greatly appreciated.

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