Could not connect external monitor through DP

[Vladimír Kriška]

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

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1449508

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Vladimír Kriška (ujovlado)]

apport information

[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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[Vladimír Kriška (ujovlado)]

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

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

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.0 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-rc1-vivid/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]