(In reply to L.S.S. from comment #7)

> from what I could find out. Before using a KVM (that I'm swapping between
> its HDMI and DP inputs that were connected to different places), whenever I
> switch the active signal, the built-in USB hub power-cycles (devices
> disconnect then reconnect), and the monitor becomes disconnected to the
> system connected to the now inactive signal.

Are you saying you're using a KVM in your setup?

Does the problem occur when the monitor is directly connected?