Hi Casey, that was very illuminating. I picked up an open box Asus Z590i Gaming Wifi board from Newegg and have been attempting (quite unsuccessfully) to get Hot Plug working for the onboard Maple Ridge Thunderbolt controller. I've read it may be possible and so was searching in IORegistryExplorer for the ACPI path and coming up empty.
But, per your post, lo and behold in the System Report under PCI it shows! If I have a device plugged in at start up it works great but that's the extent of it of course. Be nice to be able to get Hot Plug working. Is creating an SSDT to do that even possible? Appreciate any thoughts or direction you can share.
View attachment 529940?