https://bugs.kde.org/show_bug.cgi?id=365602

            Bug ID: 365602
           Summary: Multi screen issues: black screen, wrong panel
                    positions, plasmashell segfaults
           Product: plasmashell
           Version: 5.7.1
          Platform: openSUSE RPMs
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Multi-screen support
          Assignee: aleix...@kde.org
          Reporter: tim.eberha...@tu-bs.de
                CC: plasma-b...@kde.org

I have a laptop for my work which I use at two different offices.

On office #1 I have a single 1600x900 monitor connected via DVI to a dock.
On office #2 I have 2x 1920x1200 monitors connected via DP to a dock.

On both offices when I log in to KDE the external monitors are black. I can
drag the mouse over and see the cursor (so the screens are active) but no
desktop, wallpaper or widgets. I then have to go to the screen settings,
disable the external monitors, click apply (which always can be clicked twice),
wait some seconds, re-enable the screens, eventually resize to correct
resolution, click apply again (twice).
After this and a short wait the desktops are showing on the other screens. In
office #2 I always have to drag all my panels from the internal screen to the
two other screens, as they are all on screen 1 on top of each other.
Additionally plasmashell is crashing in office #2 right after applying the
final changes in kscreen with a segfault.

Reproducible: Always

Steps to Reproduce:
1. start laptop on dock
2. log in to plasma


Actual Results:  
black external screens

Expected Results:  
desktops with all panels and widgets on their place on all screens

Specs of laptop:
ThinkPad L440, Intel i5-4200M, 8GB RAM, UltraDock docks

System specs:
openSUSE Tumbleweed with KDE from Factory repos (plasma 5.7.1, frameworks
5.24.0, applications 16.04.3, Qt 5.6.1, kernel 4.6.4)

I'm attaching some files for debugging:
xsession-errors1: .xsessions-errors from office #1
xsession-errors2: .xsessions-errors from office #2
plasmashell-20160713-090550.kcrash.txt: crash info from office #2

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