Unfortunately I am experiencing the same issue. Dell Latitude with a
docking station, 2 monitors connected by DP, 1 VGA, running kernel 4.8.1

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  multi monitors - black flashes or black screen when the mouse cursor
  leaves a monitor

Status in Linux:
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  When the mouse cursor leaves one of the screens, there is either :
  - no problem
  - the screen becomes black just below the position of the cursor and 
instantly comes back to normal.
  - the screen becomes entirely black with some random colored pixels 
flickering on the far left of the screen. I have to move the cursor to the 
black screen, otherwise it stays black.

  It happens on Ubuntu Gnome 16.04 Beta and Ubuntu Mate 16.04 Beta.
  I have tested with other distributions (Debian Jessie and Fedora) and 
everything is fine.

  Hardware : Intel Ironlake (Thinkpad X201) with an external monitor
  plugged in.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+13ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-7.22-generic 4.4.2
  Uname: Linux 4.4.0-7-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.367
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Sat Mar  5 13:17:15 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
   Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] 
(rev 02) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Core Processor Integrated Graphics Controller [17aa:215a]
  LiveMediaBuild: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 
  MachineType: LENOVO 3680KD3
   PATH=(custom, no user)
  ProcKernelCmdLine: file=/cdrom/preseed/username.seed boot=casper 
initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 6QET70WW (1.40 )
  dmi.board.name: 3680KD3
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.product.name: 3680KD3
  dmi.product.version: ThinkPad X201
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.67-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.2-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.2-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Sat Mar  5 13:03:55 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
   product id                                2202 
   vendor                                     BOE
  xserver.version: 2:1.17.3-2ubuntu4

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