I recently replaced a wired KVM setup between my desktop PC and a All in one desktop/laptop with the UD-3900 Docking station and the USB3-Switch.
If I connect either system to the docking station everything works including the 3 external monitors.
But if I connect the docking station to the USB3 switch which then connects to both systems, only the desktop shows all three monitors while the all-in-one only shows 1 external monitor.
The following diagram below illustrates my setup.
The all-in-one is a Dell XPS 18 1820, Windows 10 64bit, 16GB with 2 USB 3.0 ports
The desktop is a Dell Optiplex 990 SFF (small form factor) with Windows 7 32bit, 16GB ram (although Windows only can access 4).
The 3 monitors are Dell D2015HM, vga output only at 1920 x 1080 resolution.
Steps that I tried to resolve the issue are as follows (on the All-In-One)…
A: Reinstalled the display link drivers.
-1:Removed/Uninstalled the DisplayLink drivers from the Control Panel/Add or Remove Programs
-3:Removed any remaining DisplayLink drivers using the Cleaner tool.
-5:Reinstalled the Display Link drivers.
B:Check each individual monitor cable
-1:Even though all monitors work when the Docking port is connected directly to either system, I still went ahead and checked each cable.
-2:I checked the UBS3-Switch cables by connecting/switching them to the desktop.
Now after performing the above steps, I reconnected the UD-3900 to the USB3-Switch and had the cables from that device going to both systems as originally done and the same issue happens. I cannot get all three monitors to show up when I switch to the All -in-one (except 1), but they all do show up when I switch over to the Desktop.
Could it be that the USB3-Switch is not working properly or it is something else entirely.