Eu tenho uma doca Thunderbolt OWC anexada ao meu Dell Precision M3800 (que é basicamente a mesma que a sua) através de sua interface Thunderbolt 2. Eu apenas liguei e funcionou.
Thunderbolt é hot plug pci que está no kernel do linux há algum tempo (2.6 eu acho) como é usado por alguns grandes sistemas de armazenamento, no entanto acessá-lo através de uma porta usbc é novo.
heres meu lspci com a doca
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller (rev 06)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:04.0 Signal processing controller: Intel Corporation Device 0c03 (rev 06)
00:14.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB xHCI (rev 05)
00:16.0 Communication controller: Intel Corporation 8 Series/C220 Series Chipset Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #2 (rev 05)
00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
00:1c.0 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 (rev d5)
00:1c.2 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #3 (rev d5)
00:1c.3 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #4 (rev d5)
00:1c.4 PCI bridge: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #5 (rev d5)
00:1d.0 USB controller: Intel Corporation 8 Series/C220 Series Chipset Family USB EHCI #1 (rev 05)
00:1f.0 ISA bridge: Intel Corporation HM87 Express LPC Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 8 Series/C220 Series Chipset Family 6-port SATA Controller 1 [AHCI mode] (rev 05)
00:1f.3 SMBus: Intel Corporation 8 Series/C220 Series Chipset Family SMBus Controller (rev 05)
00:1f.6 Signal processing controller: Intel Corporation 8 Series Chipset Family Thermal Management Controller (rev 05)
02:00.0 3D controller: NVIDIA Corporation GK107GLM [Quadro K1100M] (rev ff)
06:00.0 Network controller: Intel Corporation Wireless 7260 (rev bb)
07:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5249 PCI Express Card Reader (rev 01)
08:00.0 PCI bridge: Intel Corporation Device 157e
09:00.0 PCI bridge: Intel Corporation Device 157e
09:01.0 PCI bridge: Intel Corporation Device 157e
0a:00.0 System peripheral: Intel Corporation Device 157d
0b:00.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0c:00.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0c:01.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0c:02.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0c:03.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0c:04.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0c:05.0 PCI bridge: Intel Corporation DSL5520 Thunderbolt [Falcon Ridge]
0d:00.0 USB controller: Fresco Logic FL1100 USB 3.0 Host Controller (rev 10)
0e:00.0 Ethernet controller: Intel Corporation I210 Gigabit Network Connection (rev 03)
0f:00.0 USB controller: Fresco Logic FL1100 USB 3.0 Host Controller (rev 10)
10:00.0 FireWire (IEEE 1394): LSI Corporation FW643 [TrueFire] PCIe 1394b Controller (rev 08)
Seu kernel ativará a porta usb c se tiver drivers para ele, se for assim ele aparecerá na saída deste comando
lspci -d ::0c03 -k
tente novos kernels até encontrar um que possa ativá-lo, os chipsets intel devem ser totalmente suportados no kernel upstream, mas parecem não ter chegado ao Ubuntu.
Deve haver entradas em seus registros relacionadas a tentativas de ativar a porta, poste-as aqui.
Atualização:
em teoria, você deve conseguir executar o seguinte comando para verificar novamente o barramento pci, o que pode ajudar a ativar o seu dock.
echo "1" | sudo tee /sys/bus/pci/rescan > /dev/null