I can confirm that this is not fixed in kernel v4.15-rc1.

I can see the device:

---
$ cat /sys/bus/thunderbolt/devices/0-1/device_name 
Thunderbolt to FireWire Adapter
---

.. but it doesn't show up in lspci, and it doesn't look like drivers can
bind to it (I'm trying with libffado). Cold- or hotplugging makes no
difference, the result is the same.

** Tags added: kernel-bug-exists-upstream

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1726299

Title:
  Apple Thunderbolt 2 to FireWire adapter not working

Status in Linux:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  The adapter is connected through an Apple Thunderbolt 3 to Thunderbolt
  2 adapter. Ubuntu seems not to recognize the Firewire adapter.

  lsb_release -a
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description:    Ubuntu 17.04
  Release:    17.04
  Codename:   zesty

  uname -r
  4.10.0-19-generic

  sudo lshw -short
  H/W-Pfad                 Gerät     Klasse         Beschreibung
  ===============================================================
                                      system         Z170N-Gaming 5 (Default 
string)
  /0                                  bus            Z170N-Gaming 5
  /0/0                                memory         64KiB BIOS
  /0/3d                               memory         16GiB Systemspeicher
  /0/3d/0                             memory         8GiB DIMM DDR4 Synchron 
2133 MHz (0,5 ns)
  /0/3d/1                             memory         Project-Id-Version: 
lshwReport-Msgid-Bugs-To: FULL NAME <EMAIL@ADDRESS>POT-Creatio
  /0/3d/2                             memory         8GiB DIMM DDR4 Synchron 
2133 MHz (0,5 ns)
  /0/3d/3                             memory         Project-Id-Version: 
lshwReport-Msgid-Bugs-To: FULL NAME <EMAIL@ADDRESS>POT-Creatio
  /0/43                               memory         128KiB L1 Cache
  /0/44                               memory         512KiB L2 Cache
  /0/45                               memory         3MiB L3 Cache
  /0/46                               processor      Intel(R) Core(TM) i3-6100T 
CPU @ 3.20GHz
  /0/100                              bridge         Skylake Host Bridge/DRAM 
Registers
  /0/100/1                            bridge         Skylake PCIe Controller 
(x16)
  /0/100/1/0                          display        Oland GL [FirePro W2100]
  /0/100/1/0.1                        multimedia     Cape Verde/Pitcairn HDMI 
Audio [Radeon HD 7700/7800 Series]
  /0/100/14                           bus            Sunrise Point-H USB 3.0 
xHCI Controller
  /0/100/14/0              usb1       bus            xHCI Host Controller
  /0/100/14/0/6                       input          USB Gaming Keyboard
  /0/100/14/0/d                       communication  Bluetooth-Schnittstelle
  /0/100/14/1              usb2       bus            xHCI Host Controller
  /0/100/14/1/5            scsi6      storage        Storage Media
  /0/100/14/1/5/0.0.0      /dev/sdb   disk           15GB Storage Media
  /0/100/14/1/5/0.0.0/0    /dev/sdb   disk           15GB 
  /0/100/14/1/5/0.0.0/0/2  /dev/sdb2  volume         15EiB Windows FAT Laufwerk
  /0/100/16                           communication  Sunrise Point-H CSME HECI 
#1
  /0/100/17                           storage        Sunrise Point-H SATA 
controller [AHCI mode]
  /0/100/1b                           bridge         Sunrise Point-H PCI Root 
Port #17
  /0/100/1b.2                         bridge         Sunrise Point-H PCI Root 
Port #19
  /0/100/1b.3                         bridge         Sunrise Point-H PCI Root 
Port #20
  /0/100/1c                           bridge         Sunrise Point-H PCI 
Express Root Port #1
  /0/100/1c/0                         bridge         DSL6540 Thunderbolt 3 
Bridge [Alpine Ridge 4C 2015]
  /0/100/1c/0/0                       bridge         DSL6540 Thunderbolt 3 
Bridge [Alpine Ridge 4C 2015]
  /0/100/1c/0/1                       bridge         DSL6540 Thunderbolt 3 
Bridge [Alpine Ridge 4C 2015]
  /0/100/1c/0/2                       bridge         DSL6540 Thunderbolt 3 
Bridge [Alpine Ridge 4C 2015]
  /0/100/1c/0/2/0                     bus            DSL6540 USB 3.1 Controller 
[Alpine Ridge]
  /0/100/1c/0/2/0/0        usb3       bus            xHCI Host Controller
  /0/100/1c/0/2/0/0/1                 generic        Thunderbolt 3 (USB-C) to 
Thunderbolt 2 Adapter
  /0/100/1c/0/2/0/0/2                 input          USB Optical Mouse
  /0/100/1c/0/2/0/1        usb4       bus            xHCI Host Controller
  /0/100/1c/0/4                       bridge         DSL6540 Thunderbolt 3 
Bridge [Alpine Ridge 4C 2015]
  /0/100/1c.2                         bridge         Sunrise Point-H PCI 
Express Root Port #3
  /0/100/1c.3                         bridge         Sunrise Point-H PCI 
Express Root Port #4
  /0/100/1c.4                         bridge         Sunrise Point-H PCI 
Express Root Port #5
  /0/100/1c.4/0            enp13s0    network        Killer E2400 Gigabit 
Ethernet Controller
  /0/100/1c.5                         bridge         Sunrise Point-H PCI 
Express Root Port #6
  /0/100/1c.5/0            wlp14s0    network        Wireless 8260
  /0/100/1c.6                         bridge         Sunrise Point-H PCI 
Express Root Port #7
  /0/100/1c.7                         bridge         Sunrise Point-H PCI 
Express Root Port #8
  /0/100/1d                           bridge         Sunrise Point-H PCI 
Express Root Port #9
  /0/100/1f                           bridge         Sunrise Point-H LPC 
Controller
  /0/100/1f.2                         memory         Memory controller
  /0/100/1f.3                         multimedia     Sunrise Point-H HD Audio
  /0/100/1f.4                         bus            Sunrise Point-H SMBus
  /0/1                     scsi4      storage        
  /0/1/0.0.0               /dev/sda   disk           480GB TOSHIBA-TR150
  /0/1/0.0.0/1             /dev/sda1  volume         511MiB Windows FAT Laufwerk
  /0/1/0.0.0/2             /dev/sda2  volume         438GiB EXT4-Laufwerk
  /0/1/0.0.0/3             /dev/sda3  volume         8068MiB Linux swap Laufwerk
  /1

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