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[Jonathan Kamens <jik@xxxxxxxxxxxxxxxxxxxxxx>]

Problem goes away if I install nvidia-352.

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https://bugs.launchpad.net/bugs/1536165

Title:
  X server hangs on start when DisplayPort is connected

Status in xorg package in Ubuntu:
  New

Bug description:
  I just bought a new Acer Predator AG6-710, which supposedly comes with
  a NVIDIA GeForce GTX 980 graphics controller.

  It has four output plugs -- DVI, two mini DisplayPort, and HDMI.

  When I have only one monitor plugged in, on the DVI port using DVI-A,
  i.e., through a DVI-A -> VGA adapter and then a VGA cable, Ubuntu
  boots up just fine.

  However, when I have two monitors plugged in, the first as described
  above and the second through one of the DisplayPorts via a mini
  DisplayPort to DVI-I adapter and a DVI-A cable, the X server hangs on
  boot, and I end up with two blank screens and monitors claiming no
  signal is being sent.

  I've attached the Xorg log file when this happens.

  It happens every single time I boot, i.e., it is reliable.

  Any additional debugging information I can provide or debugging steps
  I can take, please ask, I will gladly help.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-25.30-generic 4.2.6
  Uname: Linux 4.2.0-25-generic x86_64
  .tmp.unity.support.test.1:
   
  ApportVersion: 2.19.1-0ubuntu5
  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: Wed Jan 20 07:13:46 2016
  DistUpgraded: Fresh install
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.10, 4.2.0-23-generic, x86_64: installed
   virtualbox, 5.0.10, 4.2.0-25-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   NVIDIA Corporation GM204 [GeForce GTX 970] [10de:13c2] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Device [196e:1131]
  InstallationDate: Installed on 2016-01-16 (4 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  MachineType: Acer Predator G6-710
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-25-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  Renderer: Software
  SourcePackage: xorg
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/21/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: R01-A1
  dmi.board.name: Predator G6-710
  dmi.board.vendor: Acer
  dmi.chassis.type: 3
  dmi.chassis.vendor: Acer
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrR01-A1:bd09/21/2015:svnAcer:pnPredatorG6-710:pvr:rvnAcer:rnPredatorG6-710:rvr:cvnAcer:ct3:cvr:
  dmi.product.name: Predator G6-710
  dmi.sys.vendor: Acer
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Wed Jan 20 06:50:52 2016
  xserver.configfile: default
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.17.2-1ubuntu9.1
  xserver.video_driver: modeset

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