Bug 1269958

Description of problem:
The update to xorg-x11-server* 1.17.2-2.fc22.2 causes two *new* problems:

1.  KDE now often comes up (after boot and first login) without any widgets on the external monitor (=primary display), just showing the KDE menu, and with the LVDS having a black background but otherwise working.
I found that a logout/login cycle often fixes this problem.
Possibly unrelated, plasmashell then crashed at kde login, as I reported here:
  https://bugs.kde.org/show_bug.cgi?id=353681

2.  Also, KDE (or its kscreen component) with the new xorg has more difficulty to decide where the primary display is located -- during KDE startup (first startup after reboot), the primary display (KDE panel, widgets etc.) is being visibly moved from LVDS to the external monitor.

These problems did *not* exist with the previous xorg-x11-server* version
(1.17.1-11.fc22).

Version-Release number of selected component (if applicable):
  xorg-x11-server-Xorg.x86_64 1.17.2-2.fc22.2
  xorg-x11-server-Xwayland.x86_64 1.17.2-2.fc22.2
  xorg-x11-server-common.x86_64 1.17.2-2.fc22.2
  xorg-x11-drv-libinput.x86_64 0.14.0-1.fc22


How reproducible:
Every time. After boot/first login to KDE, one or more logout/login cycles are needed to eventually get a fully working desktop.

Steps to Reproduce:
- Boot into kernel 4.1.3-201.fc22.x86_64 (with newer fedora kernels
  from 4.1.4 ... 4.1.6, the external monitor does not work at all !!!)

- Login to KDE takes a long time:
  - First, dolphin windows appear CENTERED on the composite
    (LVDS + ext. monitor) display (NEW BEHAVIOR with this xorg)
  - KDE desktop is briefly shown on wrong screen (LVDS)
  - Shortly thereafter, KDE desktop (including wallpaper and widgets)
    reappears briefly on the external monitor
  - Finally, KDE desktop looks as follows (broken):
    - External monitor:
      - Desktop background and widgets have disappeared
      - KDE panel and menu are present and working
    - LVDS:
      - Black background, but windows moved to it are displayed

- Logout/login again (test 1)
  - The KDE desktop appears correctly
    - External monitor shows wallpaper and widgets
    - LVDS shows background (blue graphical pattern)
  - KDE menu does NOT work (does not open when I click on it)
  - No Logout/Restart/Shutdown buttons
  - But after a couple of minutes, KDE menu suddenly DOES work

- Logout/login again (test 2)
  - The KDE desktop appears correctly
    - External monitor shows background (wallpaper) and widgets
    - LVDS shows background (blue graphical pattern)
  - KDE menu DOES work immediately


Actual results:
- After boot, first KDE login
  - creates and then relocates the primary display (slow)
  - results in broken desktop (missing widgets)
  - centers most windows on the edge between LVDS and external monitor
- Need one or more logout/login cycles to get a working desktop

Expected results:
- KDE login should create the primary display directly on configured monitor
- After boot, first KDE login should
  - result in a working desktop
  - recreate windows wherever they were at logout