[Bug 1306890] Re: KDE-Session crashes when configuring positions of multiple monitors

[3vi1]

I'm still seeing this bug still in my fully updated Ubuntu 16.04 alpha.
I can recreate it every time.

When I start my laptop, it detects the external 2560x1080 external
monitor and virtually places it to the right of the laptop screen.
Since my laptop is physically to the right of the external monitor, I
use systemsettings5/display configuration  to drag it to the left of the
virtual monitor.  If I do that in one single step, I find that it always
crashes the session as the original reported.

As a workaround, I've found I get the desired positioning in two steps
by moving the external monitor to a virtual position /above/ the laptop
screen, applying that, then moving the laptop screen to the right of the
external monitor.

HOWEVER, if I restart the system after using that workaround, KDE will
fail to start every time I login, and throw me back to lightDM.  The
only fix for that is to go to a terminal and delete the screen
configuration in ~/.local/share/kscreen/.  I then have to move the
monitors around again after logging in; I do this every reboot.  :\

There's nothing obviously wrong with the "bad" kscreen configuration
that prevents login.  I've attached it anyway - in case a dev can see
where loading it would break things.


** Attachment added: "kscreen config created by two-step reposition, which must be removed to enable login."
   https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1306890/+attachment/4551570/+files/bad_kscreen.545ce9baac837248a33134d9c9dff968

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https://bugs.launchpad.net/bugs/1306890

Title:
  KDE-Session crashes when configuring positions of multiple monitors

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