P2419H, cannot connect to PC via USB - Dell Community
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display - What do the upstream/downstream USB ports on a monitor do? - Super User
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Dell 27in Monitor - 1920x 1080p Full HD IPS Display - 1x HDMI - 1x DisplayPort - 1x USB-C/DisplayPort - 1x USB Upstream Port - 4x USB Downstream Ports » Vista IT Group
The Dell UltraSharp U3219Q Monitor with Built-in KVM Switch -- Virtualization Review
U2419H, side USB ports usage? - Dell Community
U2719DC, no USB upstream port? - Dell Community
display - What do the upstream/downstream USB ports on a monitor do? - Super User
How To Fix USB Ports Not Working On Dell Monitor
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Solved: AW2310, USB ports not working - Dell Community