When I run lsusb with only the Opus plugged into the usb port, I get this:
Bus 004 Device 003: ID 0bda:0703 Realtek Semiconductor Corp.
Bus 004 Device 002: ID 04b4:6560 Cypress Semiconductor Corp. CY7C65640 USB-2.0 "TetraHub"
Bus 004 Device 001: ID 0000:0000
Bus 002 Device 001: ID 0000:0000
Bus 003 Device 001: ID 0000:0000
Bus 001 Device 001: ID 0000:0000
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