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[SamF <1559308@xxxxxxxxxxxxxxxxxx>]

I'm also getting this problem. It seems, as others have said, to be
triggered by moving the mouse from laptop screen to external monitor or
vice versa.

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https://bugs.launchpad.net/bugs/1559308

Title:
  Plugging HDMI screen in causes system hang

Status in linux package in Ubuntu:
  Fix Committed

Bug description:
  I have a 4K UHD laptop screen and am running Ubuntu Gnome 16.04 Beta1
  using 4.4.0-13-generic and the Nouveau drivers.

  If I plug in an external HDMI monitor (FHD) either into either HDMI
  port (there's one on the machine and there's one available via a usb
  3.1 extra adaptor) then the whole system hangs, completely
  unresponsive and needing a hard reboot. Before hanging the 2nd display
  gets an image as expected, but the laptop's screen flashes randomly,
  sometimes you see weird artifacts. Then the hang comes.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xserver-xorg 1:7.7+13ubuntu3
  ProcVersionSignature: Ubuntu 4.4.0-13.29-generic 4.4.5
  Uname: Linux 4.4.0-13-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Fri Mar 18 20:43:42 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Skylake Integrated Graphics [8086:191b] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Dell Skylake Integrated Graphics [1028:06e4]
     Subsystem: Dell GM107M [GeForce GTX 960M] [1028:06e4]
  InstallationDate: Installed on 2016-03-15 (3 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160225.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f3:21d5 Elan Microelectronics Corp. 
   Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp. 
   Bus 001 Device 004: ID 0c45:6713 Microdia 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9550
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-13-generic.efi.signed root=UUID=b026feed-8801-44f4-9f3f-c245f4a1f25e ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.01.19
  dmi.board.name: 0N7TVV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr01.01.19:bd01/25/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.
  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 2:1.18.1-1ubuntu4
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.1-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.6.1-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20160218-1ubuntu3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1build2
  xserver.bootTime: Fri Mar 18 17:28:07 2016
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   Unknown chipset: NV117
   SynPS/2 Synaptics TouchPad: Read error 19
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5182 
   vendor                                     SHP
  xserver.version: 2:1.18.1-1ubuntu4

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