Application: kcmshell5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-10-generic x86_64
Distribution: Ubuntu Vivid Vervet (development branch)

-- Information about the crash:
dual display. moved external display from right to top.

samsung series 9 (2012) laptop. Monitor is on HDMI connector.
Embedded intel graphics (intel 3rd gen core processor graphics controller)

-- Backtrace:
Application: KDE Control Module (kcmshell5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f4c44fdc800 (LWP 14815))]

Thread 3 (Thread 0x7f4c31e93700 (LWP 14816)):
#0  0x00007f4c44ac58dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f4c3dbe3b72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007f4c3dbe564f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007f4c33db7049 in QXcbEventReader::run (this=0xd3e9e0) at qxcbconnection.cpp:1105
#4  0x00007f4c42b4eb0e in QThreadPrivate::start (arg=0xd3e9e0) at thread/qthread_unix.cpp:337
#5  0x00007f4c425856aa in start_thread (arg=0x7f4c31e93700) at pthread_create.c:333
#6  0x00007f4c44ad0eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f4c26251700 (LWP 14820)):
#0  __libc_enable_asynccancel () at ../sysdeps/unix/sysv/linux/x86_64/cancellation.S:57
#1  0x00007f4c44ac58d2 in poll () at ../sysdeps/unix/syscall-template.S:81
#2  0x00007f4c3d4bfebc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f4c3d4bffcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f4c42de5bfc in QEventDispatcherGlib::processEvents (this=0x7f4c180008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#5  0x00007f4c42d8a3b2 in QEventLoop::exec (this=this@entry=0x7f4c26250da0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#6  0x00007f4c42b49b44 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:503
#7  0x00007f4c2b496f45 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Qml.so.5
#8  0x00007f4c42b4eb0e in QThreadPrivate::start (arg=0x13fb9a0) at thread/qthread_unix.cpp:337
#9  0x00007f4c425856aa in start_thread (arg=0x7f4c26251700) at pthread_create.c:333
#10 0x00007f4c44ad0eed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f4c44fdc800 (LWP 14815)):
[KCrash Handler]
#6  0x00007f4c3042adf4 in isEmpty (this=0x30) at /usr/include/x86_64-linux-gnu/qt5/QtCore/qstring.h:791
#7  KScreen::ConfigOperation::hasError (this=this@entry=0x2c1d4c0) at ../../src/configoperation.cpp:76
#8  0x00007f4c3042b026 in KScreen::ConfigOperation::exec (this=0x2c1d4c0) at ../../src/configoperation.cpp:109
#9  0x00007f4c3065e33c in KCMKScreen::save (this=0x2c1d4c0) at ../../../kcm/src/kcm_kscreen.cpp:144
#10 0x00007f4c447aa3f7 in KCModuleProxy::save (this=this@entry=0xdc7640) at ../../src/kcmoduleproxy.cpp:272
#11 0x00007f4c447a7670 in KCMultiDialogPrivate::apply (this=<optimized out>) at ../../src/kcmultidialog.cpp:323
#12 0x00007f4c447a7a15 in KCMultiDialog::qt_static_metacall (_o=0x2c1d4c0, _c=QMetaObject::ReadProperty, _id=1, _a=0x0) at ./moc_kcmultidialog.cpp:112
#13 0x00007f4c42dbd999 in QMetaObject::activate (sender=sender@entry=0xe0c280, signalOffset=<optimized out>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffdf33d3690) at kernel/qobject.cpp:3716
#14 0x00007f4c42dbe027 in QMetaObject::activate (sender=sender@entry=0xe0c280, m=m@entry=0x7f4c43683a60 <QAbstractButton::staticMetaObject>, local_signal_index=local_signal_index@entry=2, argv=argv@entry=0x7ffdf33d3690) at kernel/qobject.cpp:3582
#15 0x00007f4c434f8012 in QAbstractButton::clicked (this=this@entry=0xe0c280, _t1=false) at .moc/moc_qabstractbutton.cpp:298
#16 0x00007f4c43245675 in QAbstractButtonPrivate::emitClicked (this=0xe13180) at widgets/qabstractbutton.cpp:534
#17 0x00007f4c43246299 in QAbstractButtonPrivate::click (this=0xe13180) at widgets/qabstractbutton.cpp:527
#18 0x00007f4c43246454 in QAbstractButton::mouseReleaseEvent (this=0xe0c280, e=0x7ffdf33d3b50) at widgets/qabstractbutton.cpp:1132
#19 0x00007f4c4318d1e8 in QWidget::event (this=0xe0c280, event=0x7ffdf33d3b50) at kernel/qwidget.cpp:9022
#20 0x00007f4c43149b2c in QApplicationPrivate::notify_helper (this=0xd28e90, receiver=0xe0c280, e=0x7ffdf33d3b50) at kernel/qapplication.cpp:3720
#21 0x00007f4c4314f8eb in QApplication::notify (this=0x7ffdf33d3890, receiver=0x7ffdf33d38b0, e=0x7ffdf33d3b50) at kernel/qapplication.cpp:3280
#22 0x00007f4c42d8cbfb in QCoreApplication::notifyInternal (this=0x7ffdf33d4480, receiver=receiver@entry=0xe0c280, event=event@entry=0x7ffdf33d3b50) at kernel/qcoreapplication.cpp:935
#23 0x00007f4c4314e3da in sendSpontaneousEvent (event=0x7ffdf33d3b50, receiver=0xe0c280) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#24 QApplicationPrivate::sendMouseEvent (receiver=0xe0c280, event=0x7ffdf33d3b50, alienWidget=0xe0c280, nativeWidget=0xdec7f0, buttonDown=<optimized out>, lastMouseReceiver=..., spontaneous=true) at kernel/qapplication.cpp:2751
#25 0x00007f4c431a5cc0 in QWidgetWindow::handleMouseEvent (this=0xea16d0, event=0x7ffdf33d3f60) at kernel/qwidgetwindow.cpp:543
#26 0x00007f4c431a7e33 in QWidgetWindow::event (this=0xea16d0, event=0x7ffdf33d3f60) at kernel/qwidgetwindow.cpp:210
#27 0x00007f4c43149b2c in QApplicationPrivate::notify_helper (this=0xd28e90, receiver=0xea16d0, e=0x7ffdf33d3f60) at kernel/qapplication.cpp:3720
#28 0x00007f4c4314f000 in QApplication::notify (this=0x7ffdf33d4480, receiver=0xea16d0, e=0x7ffdf33d3f60) at kernel/qapplication.cpp:3503
#29 0x00007f4c42d8cbfb in QCoreApplication::notifyInternal (this=0x7ffdf33d4480, receiver=0xea16d0, event=0x7ffdf33d3f60) at kernel/qcoreapplication.cpp:935
#30 0x00007f4c41097f82 in sendSpontaneousEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#31 QGuiApplicationPrivate::processMouseEvent (e=0x2bf74f0) at kernel/qguiapplication.cpp:1774
#32 0x00007f4c41099b45 in QGuiApplicationPrivate::processWindowSystemEvent (e=e@entry=0x2bf74f0) at kernel/qguiapplication.cpp:1576
#33 0x00007f4c4107e34f in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:572
#34 0x00007f4c33de14f0 in userEventSourceDispatch (source=<optimized out>) at eventdispatchers/qeventdispatcher_glib.cpp:70
#35 0x00007f4c3d4bfc3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#36 0x00007f4c3d4bff20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#37 0x00007f4c3d4bffcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#38 0x00007f4c42de5be7 in QEventDispatcherGlib::processEvents (this=0xd57150, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#39 0x00007f4c42d8a3b2 in QEventLoop::exec (this=this@entry=0x7ffdf33d4310, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#40 0x00007f4c4334b4b5 in QDialog::exec (this=0xdec7f0) at dialogs/qdialog.cpp:541
#41 0x00007f4c44d9c9cb in kdemain (_argc=<optimized out>, _argv=<optimized out>) at ../../kcmshell/main.cpp:307
#42 0x00007f4c449eaa40 in __libc_start_main (main=0x400730 <main(int, char**)>, argc=2, argv=0x7ffdf33d45c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffdf33d45b8) at libc-start.c:289
#43 0x0000000000400769 in _start ()

Reported using DrKonqi