Hello Riniboo,
Your very detailed explanation is great.
Mouse and keyboard both go through one or two USB hubs (depending on which port they are connected) in the docking station. It doesn't go through anything DisplayLink.
The device drops of the bus, and that's why Windows chime is going on.
When your keyboard goes down, but there's no sound, it means Windows doesn't even know the keyboard went.
The docking station doesn't use Thunderbolt. It has both USB and DisplayPort Alternate Mode support when over USB-C. There's no USB host controller on the docking station.
For your keyboard and mouse, it isn't supposed to make a difference as it uses the same pin and traffic in both USB-C and USB-A mode.
The issue you are experiencing is very low level and seems to be between the computer USB port/host and/or the docking station USB hub. Having the keyboard working when plugged in directly does NOT exclude the USB port/host as being responsible.
Your hard-drive file copy data will not go to the dock, but will stay on the laptop. That seems to direct the investigation towards the machine having the trouble with USB2 whilst on high load of USB3 traffic.
Did that start happening with Windows 10 v1809 or was that present before?
Have you raised that with Dell yet?
Kind regards,
Alban
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