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[Robert Schetterer <1555078@xxxxxxxxxxxxxxxxxx>]

i allready tested

linux-image-4.5.0-994-generic_4.5.0-994. ... amd64.deb , two days ago
from
http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-nightly/current/

until there is no diff  patch which really relates to the problem a
recent new test makes no sense at all.

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https://bugs.launchpad.net/bugs/1555078

Title:
  external displays thinkpad pro dock 90w stay switched after resume

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  external-displays-thinkpad-pro-dock-90w-stay-switched-after-resume

  from bug

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1530171


  I tested wily ,xenial, kubuntu, kernels 4.2 , 4.4 on brand new thinkpad t450s with thinkpad pro dock 90w.
  The laptop and the dock has latest fimware !
  Intel graphics driver is at latest state too.
  Also tested latest 4.5 drm intel nightly. All external displays work always when directly attached to the laptop.
  But with laptop docked, external displays are only running after boot, but fail when wake up from sleep mode configured in kde
  closing lid. This is a very common user powersetting an is awaited to work. Most of the times external displays could reconfigured i.e by script produced from arandr ( gtk gui wrapper for xrandr ). But a universal script workaround seems complicated with acpi, systemd in userland for all thinkable combinations of possible displays ( up to three include lcd on laptop are possible).

  It should simply work out of the box.

  Additional info i invested a lot of time in kernel logs and trying grub start parameter, cause there were other ugly bug with intel 915 driver ( pci lied SDE etc fixed in 4.5 ) , there is also a point in the bios configure 10s to wait for notice external displays. Also 2014 the dock had a bug ( also on windows with external displays which was fixed by new firmware ).
  It seems simply the dock does not pass external displays connected after laptop and external displays got sleep mode after wake up, prove is made by plug/unplugging external display and reenable it in kde. Also open windows were only reconstructed
  after awake with kernel 4.4 /4.5 after manual reenable, with kernel 4.2 most of the time also plasma crashes and simply undock
  crash x-server too. 

  I vote this as a bug from the lenovo dock, contact their developers  may help
  My Woraround solution find here

  https://sys4.de/de/blog/2016/03/09/external-displays-thinkpad-pro-dock-90w-stay-switched-after-resume/
  --- 
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  rschetterer   1395 F.... pulseaudio
   /dev/snd/controlC0:  rschetterer   1395 F.... pulseaudio
  DistroRelease: Ubuntu 16.04
  HibernationDevice: RESUME=UUID=98d32426-2e0d-4b74-8a22-37ba6ebb8cbb
  MachineType: LENOVO 20BX0049GE
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-11-generic root=UUID=91b76f4b-d581-4589-bbfd-3057220745e3 ro splash quiet vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-11.26-generic 4.4.4
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-11-generic N/A
   linux-backports-modules-4.4.0-11-generic  N/A
   linux-firmware                            1.156
  Tags:  xenial
  Uname: Linux 4.4.0-11-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 12/23/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET55WW (1.20 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BX0049GE
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40705 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET55WW(1.20):bd12/23/2015:svnLENOVO:pn20BX0049GE:pvrThinkPadT450s:rvnLENOVO:rn20BX0049GE:rvrSDK0J40705WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BX0049GE
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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