Thank you for your response! It is very much appreciated. On the Tiger Lake device I was testing on, the usb4-host-interface value is NOT listed in its ACPI. I then decided to query the ACPI values collected from devices in my office, to see if this issue is limited to my device. Ice Lake - 4 devices, none had "usb4-host-interface" Tiger Lake - 31 devices, none have "usb4-host-interface" Alder Lake - 32 devices, I see that 15 of them have "usb4-host-interface" in their ACPI Raptor Lake - 1 device, does not have "usb4-host-interface" It looks like only Alder Lake has usb4-host-interface listed in its ACPI for whatever reason. It seems like I cannot use usb4-host-interface as a determinant whether the CPU has Thunderbolt capabilities (thus not needing a discrete Thunderbolt chip). ExternalFacingPort is listed in devices that don't have CPUs with Thunderbolts, so that can't be a determinant. Am I missing something?
