[quote="RokeJulianLockhart, post:9, topic:934"]
what hardware the error refers to isn’t clear to me
[/quote]

Using the undermentioned:

> ~~~YAML
> hub 12-0:1.0: config failed, hub doesn't have any ports! (err -19)
> ~~~

I've ascertained what the cause is:

1. Using `lsusb -t`, I find:

   > ~~~YAML
   > /:  Bus 012.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/0p, 5000M
   > ~~~

   `Driver=xhci_hcd/0p` means it has 0 ports, which is invalid, hence the error.

1. I tried to `readlink /sys/class/usb_host/usb12` it to ascertain what the cause is, but that fails, because the device unsuccessfully enumerated. Consequently, I used `readlink /sys/bus/usb/devices/usb12` to verify the device ID:

   > ~~~log
   > ../../../devices/pci0000:00/0000:00:08.3/0000:5a:00.0/usb12
   > ~~~

1. When known, I used `5a:00.0` to locate the cause with `lspci -s 5a:00.0`:

   > ~~~YAML
   > 5a:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridge USB 2.0 xHCI
   > ~~~

   It's the virtual USB controller. I suppose I gotta take this to the kernel devs or AMD themselves, now? What a pain.