Start with evidence
Run the tests that separate the likely branches
WebUSB Device TestRequest a compatible USB device through WebUSB and display the browser-exposed manufacturer, product, vendor, and product IDs.
Run →USB Vendor & Product ID CheckRead vendor and product IDs for a WebUSB-compatible device that you explicitly select.
Run →USB-C Display Path Readiness CheckCheck four documented prerequisites for sending video through USB-C, Thunderbolt, a dock, cable or adapter to a display.
Run →Decision table
What the observation changes
ObservationWhat it meansNext action
Standard USB devices work but vendor utility does notRaw port path may be fine; software/driver compatibility is higher priority.Check vendor Windows-on-Arm support.
Dock works on one USB4 port onlyPort/connector/system state needs isolation.Swap same cable/device between ports and use Acer/Windows diagnostics.
Display fails but USB devices workFocus on dock video capability rather than total dock failure.Test display direct if possible and verify video path.
Sequence
Work from reversible checks to escalation
- 01
Test both USB4 ports.
- 02
Use dock's intended upstream cable and power supply.
- 03
Record which functions work: charge, USB, Ethernet, display.
- 04
Check vendor Arm64 support only after raw path is tested.
Likely areas
Keep these branches separate
Dock cable/powerWindows-on-Arm driver/appDisplay pathUSB class device
Repair boundary
When to stop changing settings
If neither USB4 port detects known-good standard USB devices, use Acer/Windows hardware diagnostics.