Currently, under Debian GNU/Linux (stable and testing), the
Thunderbolt controller is identified as a PCIe switch (each port of
the switch is identified as a device, and connected with an internal
PCI bus). If a device is coldplugged in Thunderbolt port, the whole
PCI subtree containing the Thunderbolt controller will be enumerated
successfully, but if a device is hotplugged, only the PCIe port of the
controller facing upstream is brought up, without everything behind it.

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