platform: imx8
cpu: aarch64
qt:5.9
dbus: D-Bus Message Bus Daemon 1.12.2
log:

root@imx8mmddr4evk:# export QT_IM_MODULE=vkim
root@imx8mmddr4evk:# ./keyboard
vkim input context plugin created

QObject::connect: No such signal QDBusAbstractInterface::commit(QString)
Unable to register at DBus
Aborted (core dumped)