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[Cs-gon <1540953@xxxxxxxxxxxxxxxxxx>]

This is the stacktrace I got from gdb...

** Attachment added: "Stacktrace.txt"
   https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1540953/+attachment/4562270/+files/Stacktrace.txt

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Title:
  Xorg crashed when undocking Lenovo T450s from docking station

Status in xorg package in Ubuntu:
  New

Bug description:
  I have a Lenovo T450s. When undocking the notebook from the docking
  station (Lenovo ProDock, two monitors are connected), Xorg frequently
  crashes.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: xorg 1:7.7+12ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-2.16-generic 4.4.0
  Uname: Linux 4.4.0-2-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.4-0ubuntu2
  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: Tue Feb  2 15:43:35 2016
  DistUpgraded: Fresh install
  DistroCodename: xenial
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:5036]
  InstallationDate: Installed on 2016-02-02 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160131)
  MachineType: LENOVO 20BWS00V00
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-2-generic root=UUID=eb42241b-c617-430d-84eb-b21a749fc2ff ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/08/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET51WW (1.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BWS00V00
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET51WW(1.16):bd07/08/2015:svnLENOVO:pn20BWS00V00:pvrThinkPadT450s:rvnLENOVO:rn20BWS00V00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BWS00V00
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+16.04.20151211-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.66-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.1.1-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.1.1-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.3-2ubuntu2
  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 2:2.99.917+git20151217-1~exp1ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-1
  xserver.bootTime: Tue Feb  2 15:33:03 2016
  xserver.configfile: default
  xserver.errors:
   systemd-logind: failed to get session: PID 3028 does not belong to any known session
   intel(0): sna_mode_shutdown_crtc: invalid state found on pipe 1, disabling CRTC:25
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4925 
   vendor                                     AUO
  xserver.version: 2:1.17.3-2ubuntu2

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