Application: systemsettings (4.11.15)
KDE Platform Version: 4.14.4
Qt Version: 4.8.6
Operating System: Linux 3.17.4-301.fc21.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
- What I was doing when the application crashed:
Plugged in AOC usb monitor and enabled in system settings. upon applying the settings the program crashed.

The crash can be reproduced every time.

-- Backtrace:
Application: System Settings (systemsettings), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f7856c8a900 (LWP 1578))]

Thread 2 (Thread 0x7f782d22c700 (LWP 1701)):
#0  0x00007f78532ac590 in pthread_cond_wait@@GLIBC_2.3.2 () at /lib64/libpthread.so.0
#1  0x00007f784fe8745a in QTWTF::TCMalloc_PageHeap::scavengerThread() () at /lib64/libQtScript.so.4
#2  0x00007f784fe87489 in  () at /lib64/libQtScript.so.4
#3  0x00007f78532a752a in start_thread () at /lib64/libpthread.so.0
#4  0x00007f78527b579d in clone () at /lib64/libc.so.6

Thread 1 (Thread 0x7f7856c8a900 (LWP 1578)):
[KCrash Handler]
#5  0x00007f782d2385e2 in XRandRConfig::toKScreenConfig() const () at /usr/lib64/kde4/plugins/kscreen/KSC_XRandR.so
#6  0x00007f782d677ada in KScreen::Config::canBeApplied(KScreen::Config*) () at /lib64/libkscreen.so.1
#7  0x00007f782d678968 in KScreen::Config::setConfig(KScreen::Config*) () at /lib64/libkscreen.so.1
#8  0x00007f782d891ea5 in KCMKScreen::save() () at /usr/lib64/kde4/kcm_kscreen.so
#9  0x00007f7855ebb7a7 in KCModuleProxy::save() () at /lib64/libkcmutils.so.4
#10 0x00007f7855c90213 in ModuleView::moduleSave(KCModuleProxy*) () at /lib64/libsystemsettingsview.so.2
#11 0x00007f7855c9289a in ModuleView::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) [clone .part.31] () at /lib64/libsystemsettingsview.so.2
#12 0x00007f785365625c in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () at /lib64/libQtCore.so.4
#13 0x00007f785496b252 in QAbstractButton::clicked(bool) () at /lib64/libQtGui.so.4
#14 0x00007f78546ab363 in QAbstractButtonPrivate::emitClicked() () at /lib64/libQtGui.so.4
#15 0x00007f78546ac7a4 in QAbstractButtonPrivate::click() () at /lib64/libQtGui.so.4
#16 0x00007f78546ac8b4 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () at /lib64/libQtGui.so.4
#17 0x00007f7854330118 in QWidget::event(QEvent*) () at /lib64/libQtGui.so.4
#18 0x00007f78542dcefc in QApplicationPrivate::notify_helper(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#19 0x00007f78542e3abf in QApplication::notify(QObject*, QEvent*) () at /lib64/libQtGui.so.4
#20 0x00007f78552a886a in KApplication::notify(QObject*, QEvent*) () at /lib64/libkdeui.so.5
#21 0x00007f785364170d in QCoreApplication::notifyInternal(QObject*, QEvent*) () at /lib64/libQtCore.so.4
#22 0x00007f78542e311f in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () at /lib64/libQtGui.so.4
#23 0x00007f7854359532 in QETWidget::translateMouseEvent(_XEvent const*) () at /lib64/libQtGui.so.4
#24 0x00007f7854357f2c in QApplication::x11ProcessEvent(_XEvent*) () at /lib64/libQtGui.so.4
#25 0x00007f785437ffb4 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () at /lib64/libQtGui.so.4
#26 0x00007f7849874aeb in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
#27 0x00007f7849874e88 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
#28 0x00007f7849874f3c in g_main_context_iteration () at /lib64/libglib-2.0.so.0
#29 0x00007f7853670a1e in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#30 0x00007f7854380136 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtGui.so.4
#31 0x00007f7853640261 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#32 0x00007f78536405c5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () at /lib64/libQtCore.so.4
#33 0x00007f7853645ca9 in QCoreApplication::exec() () at /lib64/libQtCore.so.4
#34 0x000000000040a97f in main ()

Reported using DrKonqi