Re: [PATCH v4] PCI: Relabel JHL6540 on Lenovo X1 Carbon 7,8

Esther Shimanovich
2024-04-18T19:43:19Z

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?