https://bugs.kde.org/show_bug.cgi?id=419402

magib...@hotmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[Wayland] Only mouse cursor |[Wayland] With a secondary
                   |is drawn after updating     |display, only mouse cursor
                   |Window Decorations          |is drawn after updating
                   |                            |Window Decorations

--- Comment #3 from magib...@hotmail.com ---
Oops, sorry for the backtrace spam. I will use attachments next time.

I managed to narrow the issue quite a bit: I realized that my display setup is
not standard. I am using a laptop with the lid closed connected to an external
screen. In the Display Configuration, the laptop screen is not enabled while
the external monitor is.

If I start plasma without the external monitor, then the issue cannot be
reproduced. In that case, the relevant console output of the plasma session is:

> kdeinit5: Got EXEC_NEW '/usr/lib/qt/plugins/kf5/kio/desktop.so' from launcher.
> kdeinit5: preparing to launch '/usr/lib/qt/plugins/kf5/kio/desktop.so'
> kdeinit5: Got EXEC_NEW '/usr/lib/qt/plugins/kf5/kio/file.so' from launcher.
> kdeinit5: preparing to launch '/usr/lib/qt/plugins/kf5/kio/file.so'
> kdeinit5: Got EXEC_NEW '/usr/lib/qt/plugins/kf5/kio/file.so' from launcher.
> kdeinit5: preparing to launch '/usr/lib/qt/plugins/kf5/kio/file.so'
> kdeinit5: Got EXEC_NEW '/usr/lib/qt/plugins/kf5/kio/file.so' from launcher.
> kdeinit5: preparing to launch '/usr/lib/qt/plugins/kf5/kio/file.so'
> OpenGL vendor string:                   Intel Open Source Technology Center
> OpenGL renderer string:                 Mesa DRI Intel(R) HD Graphics 520 
> (Skylake GT2) 
> OpenGL version string:                  4.6 (Core Profile) Mesa 19.3.4
> OpenGL shading language version string: 4.60
> Driver:                                 Intel
> GPU class:                              Unknown
> OpenGL version:                         4.6
> GLSL version:                           4.60
> Mesa version:                           19.3.4
> X server version:                       1.20.7
> Linux kernel version:                   5.5.13
> Requires strict binding:                no
> GLSL shaders:                           yes
> Texture NPOT support:                   yes
> Virtual Machine:                        no
> Filter multi-plane format 961959257
> Filter multi-plane format 825316697
> Filter multi-plane format 842093913
> Filter multi-plane format 909202777
> Filter multi-plane format 875713881
> Filter multi-plane format 961893977
> Filter multi-plane format 825316953
> Filter multi-plane format 842094169
> Filter multi-plane format 909203033
> Filter multi-plane format 875714137
> Filter multi-plane format 842094158
> Filter multi-plane format 909203022
> CoverSwitchConfig::instance called after the first use - ignoring
> FlipSwitchConfig::instance called after the first use - ignoring
> KscreenConfig::instance called after the first use - ignoring
> MouseClickConfig::instance called after the first use - ignoring
> SlideConfig::instance called after the first use - ignoring
> SlidingPopupsConfig::instance called after the first use - ignoring

Which reveals that the libpng error messages are gone.

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