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[Pontus Pihlgren <pontus.pihlgren@xxxxxxxxx>]

I see the same error message when either docking my laptop or attaching
a monitor to a displayport on the dock. There are some differences. I
use a Dell Latitude E7470 and a Dell dock (will have to look up the
model). After the messaged shown in this bug my kernel freezes. If you
think these differences warrants a separate bug, please let me know.

Here is someone else that is affected: https://ulikoenig.de/skylake-
unter-linux-zum-laufen-kriegen-am-beispiel-eines-dell-latitude-e7270/

Here is my complete error message, I hade to transcribe it from a photo,
the kernel freezes completely and doesn't reboot:

[drm:intel_dp_start_link_train [i915]] *ERROR* too many voltage retries, give up
[drm:indel_dp_complete_link_train [i915]] *ERROR* Timed out waiting for DP idle patterns
Kernel panic - not syncing: Timeout: Not all CPUs entered broadcast exception handler
Shutting down cpus with NMI
Kernel Offset: disabled
drm_kms_helper: panic_occurred, switching back to text console
Rebooting in 30 seconds.._

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https://bugs.launchpad.net/bugs/1568573

Title:
  i915 Skylake - Ultra Dock external displays not detected after
  suspend/resume cycle

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hello,
  System is Thinkpad T460, Skylake graphics, Thinkpad Ultra dock. DVI and HDMI displays connected via dock. 4.4.0-18.

  After a suspend-resume cycle, when the laptop is docked the dock
  connected external displays are not initialized/connected. If I
  disconnect the displays from the dock and connect them directly to the
  laptop, they are initialized successfully and can be configured via
  xrandr etc.

  If the laptop is power cycled, the displays can be used normally until
  the next suspend-resume cycle.

  Example from relevant dmesg:
  [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many voltage retries, give up
  [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many voltage retries, give up
  [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many voltage retries, give up
  [drm:intel_dp_start_link_train [i915_bpo]] *ERROR* failed to train DP, aborting
  [drm:intel_dp_set_idle_link_train [i915_bpo]] *ERROR* Timed out waiting for DP idle patterns
  [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many voltage retries, give up
  [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many voltage retries, give up
  [drm:intel_dp_link_training_clock_recovery [i915_bpo]] *ERROR* too many voltage retries, give up

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-18-generic 4.4.0-18.34
  ProcVersionSignature: Ubuntu 4.4.0-18.34-generic 4.4.6
  Uname: Linux 4.4.0-18-generic x86_64
  ApportVersion: 2.20.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ryan       1838 F.... pulseaudio
  Date: Sun Apr 10 09:39:32 2016
  HibernationDevice: RESUME=UUID=04e04e17-3976-4daa-a1dd-2dd369aee83d
  InstallationDate: Installed on 2015-09-21 (201 days ago)
  InstallationMedia: It
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20FNCTO1WW
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-18-generic root=/dev/mapper/it--vg-root ro quiet
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-18-generic N/A
   linux-backports-modules-4.4.0-18-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: Upgraded to xenial on 2016-02-24 (45 days ago)
  dmi.bios.date: 03/09/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: R06ET35W (1.09 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20FNCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40697 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrR06ET35W(1.09):bd03/09/2016:svnLENOVO:pn20FNCTO1WW:pvrThinkPadT460:rvnLENOVO:rn20FNCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20FNCTO1WW
  dmi.product.version: ThinkPad T460
  dmi.sys.vendor: LENOVO

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