Hi Christopher,
Thanks for your attention!
Like I said in previous comment I don't have this bug anymore after upgrading 
to linux 4.13

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https://bugs.launchpad.net/bugs/1714122

Title:
  latest skype update causes xorg to segfault

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  After update skypeforlinux to 8.5.76.55323 I've started to get xorg segfaults 
when connected to 2 external monitors via docking station.
  My setup: Dell XPS 13 9360 + Dell DS1000 USB-C docking station+2 external 
FullHD Dell monitors.
  In xorg logs I can see:

  [ 17917.757] (II) LoadModule: "modesetting"
  [ 17917.757] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
  [ 17917.757] (II) Module modesetting: vendor="X.Org Foundation"
  [ 17917.757]    compiled for 1.18.4, module version = 1.18.4
  [ 17917.757]    Module class: X.Org Video Driver
  [ 17917.757]    ABI class: X.Org Video Driver, version 20.0
  [ 17917.757] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
  [ 17917.759] (II) modeset(0): using drv /dev/dri/card0
  [ 17917.759] (EE) 
  [ 17917.759] (EE) Backtrace:
  [ 17917.759] (EE) 0: /usr/lib/xorg/Xorg (xorg_backtrace+0x4e) [0x55c4f0526b6e]
  [ 17917.759] (EE) 1: /usr/lib/xorg/Xorg (0x55c4f0374000+0x1b6ef9) 
[0x55c4f052aef9]
  [ 17917.759] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fb6199e2000+0x354b0) 
[0x7fb619a174b0]
  [ 17917.759] (EE) 3: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 
(pci_device_next+0x118) [0x7fb61afd1a38]
  [ 17917.759] (EE) 4: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 
(pci_device_find_by_slot+0x3b) [0x7fb61afd1abb]
  [ 17917.759] (EE) 5: /usr/lib/x86_64-linux-gnu/libpciaccess.so.0 
(pci_device_vgaarb_init+0xaf) [0x7fb61afd37af]
  [ 17917.759] (EE) 6: /usr/lib/xorg/Xorg (0x55c4f0374000+0xb1a39) 
[0x55c4f0425a39]
  [ 17917.759] (EE) 7: /usr/lib/xorg/Xorg (xf86BusConfig+0x62) [0x55c4f03fe7a2]
  [ 17917.759] (EE) 8: /usr/lib/xorg/Xorg (InitOutput+0x968) [0x55c4f040cd58]
  [ 17917.759] (EE) 9: /usr/lib/xorg/Xorg (0x55c4f0374000+0x57be4) 
[0x55c4f03cbbe4]
  [ 17917.759] (EE) 10: /lib/x86_64-linux-gnu/libc.so.6 
(__libc_start_main+0xf0) [0x7fb619a02830]
  [ 17917.759] (EE) 11: /usr/lib/xorg/Xorg (_start+0x29) [0x55c4f03b6049]
  [ 17917.759] (EE) 
  [ 17917.759] (EE) Segmentation fault at address 0x0
  [ 17917.759] (EE) 
  Fatal server error:
  [ 17917.759] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [ 17917.759] (EE) 
  [ 17917.759] (EE) 
  Please consult the The X.Org Foundation support 
           at http://wiki.x.org
   for help. 
  [ 17917.759] (EE) Please also check the log file at "/var/log/Xorg.1.log" for 
additional information.
  [ 17917.759] (EE) 
  [ 17917.816] (EE) Server terminated with error (1). Closing log file.

  I'm not facing this issue when I'm not connected to external monitors.
  Any help will be much appretiated.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg (not installed)
  ProcVersionSignature: Ubuntu 4.10.0-33.37~16.04.1-generic 4.10.17
  Uname: Linux 4.10.0-33-generic x86_64
  .tmp.unity_support_test.0:
   
  ApportVersion: 2.20.1-0ubuntu2.10
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Wed Aug 30 18:27:41 2017
  DistUpgraded: Fresh install
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  DistroCodename: xenial
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Device [8086:5916] (rev 02) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:075b]
  InstallationDate: Installed on 2016-10-06 (328 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
20160624-10:47
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0c45:670c Microdia 
   Bus 001 Device 002: ID 0cf3:e301 Atheros Communications, Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 13 9360
  ProcEnviron:
   LANGUAGE=en_US
   TERM=xterm-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.10.0-33-generic 
root=UUID=f79f9409-625c-4f78-83af-cf2cf7928690 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/02/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 2.1.0
  dmi.board.name: 0839Y6
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr2.1.0:bd08/02/2017:svnDellInc.:pnXPS139360:pvr:rvnDellInc.:rn0839Y6:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9360
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160823-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.76-1~ubuntu16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 17.0.7-0ubuntu0.16.04.2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 17.0.7-0ubuntu0.16.04.2
  version.xserver-xorg-core: xserver-xorg-core N/A
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
  version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

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