A: The name is cosmetic. The underlying driver is still usbxhci.sys . The custom name comes from the .INF file provided by Intel or AMD.
A: Partially. USB4 controllers embed an xHCI-compatible interface for backward compatibility with USB 3.2 and older devices. For full USB4 features (80 Gbps, PCIe tunneling), a separate USB4 host controller driver is required. usb xhci compliant host controller driver windows 10 64 bit
Corrupt driver cache, Windows update conflict, or BIOS misconfiguration. A: The name is cosmetic