This problem is solved for me after applying the latest updates.

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https://bugs.launchpad.net/bugs/1593586

Title:
  Issue with two external screens

Status in xorg package in Ubuntu:
  New

Bug description:
  When I boot my Laptop (Dell latitude 7470 + Dell E-Port Plus II docking 
station) with two external Dell screens attached (via Display port, each 
separate connected) at the beginning of my session everything works fine.
  The lid is closed while booting.

  After starting Firefox the focus of the mouse is some how lost. Then
  it is not possible to open the context menu of Firefox. Typed letters
  appear on the other screen.

  The focus is also lost when I remove the Laptop from the
  dockingstation and attach it back to the docking station.

  The focus works fine when only the built-in display is used.

  WORKAROUND: Boot the laptop at the beginning with only one attached
  screen (cable disconnected). After login attach the second screen,
  open the "Displays" configuration menu, and click on something without
  changing the configuration.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
  Uname: Linux 4.4.0-24-generic x86_64
  .tmp.unity_support_test.0:

  ApportVersion: 2.20.1-0ubuntu2.1
  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
  CurrentDesktop: Unity
  Date: Fri Jun 17 08:16:07 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation Sky Lake Integrated Graphics [8086:1916] (rev 07) (prog-if 
00 [VGA controller])
     Subsystem: Dell Skylake Integrated Graphics [1028:06dc]
  InstallationDate: Installed on 2016-06-10 (6 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  MachineType: Dell Inc. Latitude E7470
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-24-generic 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/18/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.5.3
  dmi.board.name: 0T6HHJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.5.3:bd04/18/2016:svnDellInc.:pnLatitudeE7470:pvr:rvnDellInc.:rn0T6HHJ:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7470
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz 1:0.9.12.2+16.04.20160526-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1ubuntu0.16.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.2.0-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.2.0-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.3-1ubuntu2.2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20160325-1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.12-1build2
  xserver.bootTime: Fri Jun 17 08:04:44 2016
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1168
   vendor                                     LGD
  xserver.version: 2:1.18.3-1ubuntu2.2

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