When there is no signal, your external monitor should go to sleep.
I believe you have a blank image because we don't have access to what we need display.
Now you've done a clean install, would you please gather new log files so I can see if we meet any error?
You could also try to reinstall the graphics drivers before installing DisplayLink's. The last entries I see in your setupapi log (= Windows Installer) is Dell/Intel Graphics Drivers. You can get the latest drivers from Intel website.
I personally don't believe the issue is deeper than that.
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