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
This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:
apport-collect 1555078
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.