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** Changed in: linux (Ubuntu)
Status: New => Incomplete
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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/
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