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[Vladimír Kriška <1427221@xxxxxxxxxxxxxxxxxx>]

I updated system today, probably one of the libdrm* packages fixed it.


** Changed in: linux (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1427221

Title:
  i915, broadwell, cannot connect external monitor through Display Port

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Fix Released

Bug description:
  Hi, on new laptop (thinkpad t450s) I get error message after connecting external monitor:
  [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to train DP, aborting

  And after that, monitor is turned to sleep mode. Interesting thing is,
  that monitor is detected.

  I've already reported bug to kernel intel-gfx, so some additional informations can be found there:
  https://bugzilla.kernel.org/show_bug.cgi?id=94121

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: xserver-xorg-video-intel 2:2.99.914-1~exp1ubuntu4.2
  Uname: Linux 3.19.0-031900-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.2
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Mon Mar  2 14:17:36 2015
  InstallationDate: Installed on 2015-02-26 (3 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  SourcePackage: xserver-xorg-video-intel
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.16.2-0ubuntu5
  Architecture: amd64
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 15.04
  InstallationDate: Installed on 2015-03-10 (19 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Tags:  vivid
  Uname: Linux 3.19.0-10-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-03-30 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  --- 
  ApportVersion: 2.16.2-0ubuntu5
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  DistUpgraded: 2015-03-30 14:23:37,107 DEBUG enabling apt cron job
  DistroCodename: vivid
  DistroRelease: Ubuntu 15.04
  DistroVariant: ubuntu
  DkmsStatus:
   vboxhost, 4.3.26, 3.16.0-33-generic, x86_64: installed
   vboxhost, 4.3.26, 3.19.0-10-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:5036]
  InstallationDate: Installed on 2015-03-10 (19 days ago)
  InstallationMedia: Xubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20BX001YXS
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-10-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Tags:  vivid ubuntu
  Uname: Linux 3.19.0-10-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-03-30 (0 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 12/09/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET39WW (1.04 )
  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:bvrJBET39WW(1.04):bd12/09/2014:svnLENOVO:pn20BX001YXS:pvrThinkPadT450s:rvnLENOVO:rn20BX001YXS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BX001YXS
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.59-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.0-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.0-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0-1ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917-1~exp1ubuntu2build1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu2build1
  xserver.bootTime: Mon Mar 30 17:09:53 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                1133 
   vendor                                     LGD
  xserver.version: 2:1.17.1-0ubuntu3

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