A detailed answer to this problem is provided here: 
https://www.spinics.net/lists/linux-media/msg131388.html 
In summary, these "complex" webcams need drivers both in kernel space and user 
space, and it will take some time before they are supported under linux.
If ubuntu devs can help to speed up the development of these drivers, this 
would be appreciated!

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https://bugs.launchpad.net/bugs/1737536

Title:
  Webcams not working on a Dell Latitude 5285 laptop

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I installed ubuntu 17.10 on a Dell latitude 5285 detachable laptop.
  Unfortunately, the webcams (both rear and front) do not work.
  There is no /dev/video* file.
  I tried upgrading the kernel to version 4.14 and 4.15rc3, but the problem is 
still there.
  Below are my lsusb and lspci outputs.

  $ lspci
  00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor 
Host Bridge/DRAM Registers (rev 02)
  00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02)
  00:04.0 Signal processing controller: Intel Corporation Skylake Processor 
Thermal Subsystem (rev 02)
  00:05.0 Multimedia controller: Intel Corporation Skylake Imaging Unit (rev 01)
  00:13.0 Non-VGA unclassified device: Intel Corporation Device 9d35 (rev 21)
  00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI 
Controller (rev 21)
  00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP 
Thermal subsystem (rev 21)
  00:14.3 Multimedia controller: Intel Corporation Device 9d32 (rev 01)
  00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP 
Serial IO I2C Controller #0 (rev 21)
  00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP 
Serial IO I2C Controller #1 (rev 21)
  00:15.2 Signal processing controller: Intel Corporation Sunrise Point-LP 
Serial IO I2C Controller #2 (rev 21)
  00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME 
HECI #1 (rev 21)
  00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port 
#5 (rev f1)
  00:1c.7 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port 
#8 (rev f1)
  00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port 
#9 (rev f1)
  00:1f.0 ISA bridge: Intel Corporation Device 9d4e (rev 21)
  00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
  00:1f.3 Audio device: Intel Corporation Device 9d71 (rev 21)
  00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
  01:00.0 Non-Volatile memory controller: Toshiba America Info Systems Device 
0116
  02:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
  03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI 
Express Card Reader (rev 01)

  $ lsusb
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 003: ID 8087:0a2b Intel Corp.
  Bus 001 Device 004: ID 044e:1218 Alps Electric Co., Ltd
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

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