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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

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Triaged


** Tags: amd64 apport-bug apport-collected kernel-bug-exists-upstream kernel-bug-exists-upstream-4.0-rc6 latest-bios-1.10 ubuntu utopic vivid
-- 
i915, broadwell, cannot connect external monitor through Display Port
https://bugs.launchpad.net/bugs/1427221
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