Update: Due a lot of testing, my best speculate is, that the Thinkpad pro dock
90 w acts as MST-DP Hub ( Display Port 1.2 Hub )
After Docking the Kernel renames DP Ports, this is needed in use with real DP
1.2 Displays. But from then ( docked in ) the resume code in DRM is not longer
working (
looks like there should be a better workaround is possible with kde powerdevil
described here
https://bugs.kde.org/show_bug.cgi?id=360766
** Bug watch added: KDE Bug Tracking System #360766
https://bugs.kde.org/show_bug.cgi?id=360766
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tested latest from
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.5-rc7-wily/
on xenial dev 16.04
Problem is not solved as awaited
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https://bugs.launchpad.net/bugs/1555078
Title:
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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You received this
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.5 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
apport information
** Tags added: apport-collected xenial
** Description changed:
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
