$ kwin_wayland --xwayland
No backend specified through command line argument, trying auto resolution
kglobalaccel-runtime: Failed to register service org.kde.kglobalaccel
OpenGL vendor string:                   Intel Open Source Technology Center
OpenGL renderer string:                 Mesa DRI Intel(R) Haswell Desktop 
OpenGL version string:                  3.0 Mesa 13.0.2
OpenGL shading language version string: 1.30
Driver:                                 Intel
GPU class:                              Haswell
OpenGL version:                         3.0
GLSL version:                           1.30
Mesa version:                           13.0.2
Linux kernel version:                   4.8.11
Requires strict binding:                no
GLSL shaders:                           yes
Texture NPOT support:                   yes
Virtual Machine:                        no
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
glamor: EGL version 1.4 (DRI2):
X-Server started on display :1
Configuring Lock Action
file:///usr/share/kwin/virtualkeyboard/main.qml:21:1: module "QtQuick.VirtualKeyboard" is not installed 
     import QtQuick.VirtualKeyboard 2.1 
     ^
file:///usr/share/kwin/virtualkeyboard/main-enterprise.qml:21:1: module "QtQuick.Enterprise.VirtualKeyboard" is not installed 
     import QtQuick.Enterprise.VirtualKeyboard 2.0 
     ^
The session is not registered:  "PID 27972 does not belong to any known session"
^C/usr/bin/Xwayland: symbol lookup error: /usr/lib64/libLLVMSelectionDAG.so.39: undefined symbol: _ZN4llvm19MachinePassRegistry6RemoveEPNS_23MachinePassRegistryNodeE