kwin_wayland.log

$ kwin_wayland --xwayland "plasmashell -p org.kde.plasma.phone"
No backend specified through command line argument, trying auto resolution
OpenGL vendor string:                   X.Org
OpenGL renderer string:                 Radeon RX 580 Series (POLARIS10, DRM 3.27.0, 5.0.3, LLVM 7.0.1)
OpenGL version string:                  4.5 (Compatibility Profile) Mesa 18.3.4
OpenGL shading language version string: 4.50
Driver:                                 Unknown
GPU class:                              Unknown
OpenGL version:                         4.5
GLSL version:                           4.50
Mesa version:                           18.3.4
Linux kernel version:                   5.0.3
Requires strict binding:                no
GLSL shaders:                           yes
Texture NPOT support:                   yes
Virtual Machine:                        no
_XSERVTransSocketUNIXCreateListener: ...SocketCreateListener() failed
_XSERVTransMakeAllCOTSServerListeners: server already running
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning:          Unsupported high keycode 372 for name <I372> ignored
>                   X11 cannot support keycodes above 255.
>                   This warning only shows for the first high keycode.
Errors from xkbcomp are not fatal to the X server
X-Server started on display :1
org.kde.kwindowsystem: Could not find any platform plugin
Configuring Lock Action
Session path: "/org/freedesktop/login1/session/_31"
The XKEYBOARD keymap compiler (xkbcomp) reports:
> Warning:          Unsupported maximum keycode 374, clipping.
>                   X11 cannot support keycodes above 255.
> Warning:          Unsupported high keycode 372 for name <I372> ignored
>                   X11 cannot support keycodes above 255.
>                   This warning only shows for the first high keycode.
Errors from xkbcomp are not fatal to the X server