HP Thunderbolt Dock G4 (120 W supply): ports, screens and setup

Identify this exact dock

Do not transfer the 280 W combo-cable model’s workstation charging claim to this 120 W USB-C model.

Match the complete model printed on the unit. Up to four 4K displays is host-dependent. Check DP 1.4 DSC, output combinations and the exact OS. HP Thunderbolt G4 Dock data sheet and variant notes

Which port is for what?

This is a functional port reference, not a drawing of the physical socket positions. Follow the labels on your unit. HP Thunderbolt G4 Dock data sheet and variant notes

Before connecting

Up to 100 W USB-C host delivery; 120 W names the supply, not laptop delivery.

Use the intended powered-dock setup and host cable. Record each monitor’s input, resolution and refresh rate. Keep those requirements separate from the dock’s total port count.

Bring the desk up one screen at a time

1. Connect the specified power supply to the dock.
2. Connect the laptop using attached usb-c / thunderbolt computer cable.
3. Attach one screen on a listed video path and select its wired input.
4. Confirm the operating system recognizes that screen before adding another supported screen.
5. Select the required modes and an extended desktop where supported. Check charging, reconnecting and your essential applications.

A useful check when something fails

If displays work but the dock power button does not start the laptop, check the supported-host list. HP limits several management functions, including wake and MAC address passthrough, to HP or specifically supported notebooks. Video success does not establish those features.

Change one part of the arrangement at a time. Keep a note of the working monitor, cable and port so you can reproduce the result. If the remaining requirement has no documented answer, ask the manufacturer about the exact models instead of assuming the entire dock is defective.

Is it worth buying or replacing?

For a used unit, identify the supply and cable before comparing price. Match the complete G4 variant, then confirm the host’s own power requirement. HP also notes that it does not supply Mac Ethernet and audio drivers; check those peripherals separately.

Use the setup checklist to compare complete arrangements, including any adapters and separate charger. The evidence here is documentation-based; Connect Your Dock has not physically tested this desk.