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[Bug 1427221] [NEW] i915, broadwell, cannot connect external monitor through Display Port

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From: Launchpad Bug Tracker <1427221@xxxxxxxxxxxxxxxxxx>
Date: Mon, 02 Mar 2015 23:24:22 -0000
Reply-to: Bug 1427221 <1427221@xxxxxxxxxxxxxxxxxx>
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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)

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug utopic
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i915, broadwell, cannot connect external monitor through Display Port
https://bugs.launchpad.net/bugs/1427221
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