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[Vladimír Kriška <1449508@xxxxxxxxxxxxxxxxxx>]

At the end of CurrentDmesg.txt you can see problem.

[drm:intel_dp_complete_link_train [i915]] *ERROR* failed to train DP,
aborting

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1449508

Title:
  Could not connect external monitor through DP

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  This issue was fixed few days ago, but after upgrading to kernel
  3.19.0-15-generic it's there again.

  Old issue: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1427221
  --- 
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  vlado      1643 F.... pulseaudio
   /dev/snd/controlC0:  vlado      1643 F.... pulseaudio
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=d80fa3b5-cda8-47ca-888c-a6dcb14f919b
  InstallationDate: Installed on 2015-03-10 (48 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20BX001YXS
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-15-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  Tags:  vivid
  Uname: Linux 3.19.0-15-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-03-30 (28 days ago)
  UserGroups: adm cdrom dip docker lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/03/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET45WW (1.10 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BX001YXS
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET45WW(1.10):bd02/03/2015:svnLENOVO:pn20BX001YXS:pvrThinkPadT450s:rvnLENOVO:rn20BX001YXS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BX001YXS
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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