https://bugs.kde.org/show_bug.cgi?id=365040
--- Comment #2 from Andreas Cord-Landwehr <cordlandw...@kde.org> ---
You are right; I looked at the wrong code location. Here is a probably more
verbose output. I now generated a backtrace for getting the debug message:
kcmshell5(30793)/(kscreen) KScreen::BackendManager::startBackend: starting
external backend launcher for ""
At this point, I have (added an assert in
"/opt/kde/src/kde/workspace/libkscreen/src/backendmanager.cpp", line=291):
#5 0x00007fffda2f3bc6 in KScreen::BackendManager::startBackend(QString const&,
QMap<QString, QVariant> const&) (this=0x6af270, backend=..., arguments=...)
at /opt/kde/src/kde/workspace/libkscreen/src/backendmanager.cpp:291
#6 0x00007fffda2f3aca in KScreen::BackendManager::requestBackend()
(this=0x6af270) at
/opt/kde/src/kde/workspace/libkscreen/src/backendmanager.cpp:276
#7 0x00007fffda2fe5cb in KScreen::ConfigOperationPrivate::requestBackend()
(this=0x9265f0) at
/opt/kde/src/kde/workspace/libkscreen/src/configoperation.cpp:45
#8 0x00007fffda30019e in KScreen::GetConfigOperation::start() (this=0x92bfd0)
at /opt/kde/src/kde/workspace/libkscreen/src/getconfigoperation.cpp:178
#9 0x00007fffda315dcd in
KScreen::ConfigOperation::qt_static_metacall(QObject*, QMetaObject::Call, int,
void**) (_o=0x92bfd0, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0x92bd10)
at /opt/kde/build/kde/workspace/libkscreen/src/moc_configoperation.cpp:81
#10 0x00007ffff4d8ad07 in QMetaCallEvent::placeMetaCall(QObject*)
(this=0x93afb0, object=0x92bfd0) at kernel/qobject.cpp:495
#11 0x00007ffff4d8bda0 in QObject::event(QEvent*) (this=0x92bfd0, e=0x93afb0)
at kernel/qobject.cpp:1256
#12 0x00007ffff594a4f2 in QApplicationPrivate::notify_helper(QObject*, QEvent*)
(this=0x61a250, receiver=0x92bfd0, e=0x93afb0) at kernel/qapplication.cpp:3804
#13 0x00007ffff59478bd in QApplication::notify(QObject*, QEvent*)
(this=0x7fffffffd1f0, receiver=0x92bfd0, e=0x93afb0) at
kernel/qapplication.cpp:3163
#14 0x00007ffff4d51bfa in QCoreApplication::notifyInternal2(QObject*, QEvent*)
(receiver=0x92bfd0, event=0x93afb0) at kernel/qcoreapplication.cpp:1015
#15 0x00007ffff4d55c30 in QCoreApplication::sendEvent(QObject*, QEvent*)
(receiver=0x92bfd0, event=0x93afb0) at
../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:225
#16 0x00007ffff4d52fe2 in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) (receiver=0x0, event_type=0, data=0x6190d0) at
kernel/qcoreapplication.cpp:1650
#17 0x00007ffff4d52962 in QCoreApplication::sendPostedEvents(QObject*, int)
(receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1508
#18 0x00007ffff4dcbb2c in postEventSourceDispatch(GSource*, GSourceFunc,
gpointer) (s=0x672fb0) at kernel/qeventdispatcher_glib.cpp:270
#19 0x00007fffed56a1a7 in g_main_context_dispatch (context=0x7fffdc0016f0) at
/build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3154
#20 0x00007fffed56a1a7 in g_main_context_dispatch
(context=context@entry=0x7fffdc0016f0) at
/build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3769
#21 0x00007fffed56a400 in g_main_context_iterate
(context=context@entry=0x7fffdc0016f0, block=block@entry=1,
dispatch=dispatch@entry=1, self=<optimized out>)
at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3840
---Type <return> to continue, or q <return> to quit---
#22 0x00007fffed56a4ac in g_main_context_iteration (context=0x7fffdc0016f0,
may_block=1) at /build/glib2.0-wnDt2X/glib2.0-2.48.1/./glib/gmain.c:3901
#23 0x00007ffff4dcc305 in
QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x67ceb0, flags=...) at kernel/qeventdispatcher_glib.cpp:417
#24 0x00007fffe78cce86 in
QPAEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x67ceb0, flags=...) at eventdispatchers/qeventdispatcher_glib.cpp:115
#25 0x00007ffff4d4e570 in
QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>)
(this=0x7fffffffd050, flags=...) at kernel/qeventloop.cpp:128
#26 0x00007ffff4d4e86c in
QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) (this=0x7fffffffd050,
flags=...) at kernel/qeventloop.cpp:204
#27 0x00007ffff4d52344 in QCoreApplication::exec() () at
kernel/qcoreapplication.cpp:1285
#28 0x00007ffff517d598 in QGuiApplication::exec() () at
kernel/qguiapplication.cpp:1607
#29 0x00007ffff59472a1 in QApplication::exec() () at
kernel/qapplication.cpp:2979
#30 0x00007ffff7bd4210 in kdemain(int, char**) (_argc=2, _argv=0x7fffffffdb18)
at /opt/kde/src/kde/workspace/kde-cli-tools/kcmshell/main.cpp:294
#31 0x00000000004009a8 in main(int, char**) (argc=2, argv=0x7fffffffdb18) at
/opt/kde/build/kde/workspace/kde-cli-tools/kcmshell/kcmshell5_dummy.cpp:3
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