Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

Toying around with multiple desktop settings, I managed to create a setup, with which the "Display" settings can't be opened. Randr is mentioned in xorg.conf, but auto-disabled on X startup.

Application: System Settings (systemsettings), signal SIGSEGV
0x00007fd708d28fd0 in __nanosleep_nocancel () from /lib/libc.so.6

Thread 1 (Thread 0x7fd70c86d750 (LWP 19589)):
[KCrash Handler]
#5  0x00007fd70195231c in RandRDisplay::isValid (this=0x0) at /home/e/kde/src/KDE/kdebase/workspace/kcontrol/randr/randrdisplay.cpp:112
#6  0x00007fd70194e102 in LegacyRandRConfig::load (this=0x620740) at /home/e/kde/src/KDE/kdebase/workspace/kcontrol/randr/legacyrandrconfig.cpp:67
#7  0x00007fd70194bd86 in KRandRModule::load (this=0x120d690) at /home/e/kde/src/KDE/kdebase/workspace/kcontrol/randr/krandrmodule.cpp:106
#8  0x00007fd70b73b0b3 in KCModule::qt_metacall (this=0x120d690, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x12940f0) at /home/e/kde/build/kdelibs/kdeui/kcmodule.moc:78
#9  0x00007fd70194bc21 in KRandRModule::qt_metacall (this=0x120d690, _c=QMetaObject::InvokeMetaMethod, _id=29, _a=0x12940f0) at /home/e/kde/build/kdebase/workspace/kcontrol/randr/krandrmodule.moc:58
#10 0x00007fd70aa6be3b in QMetaCallEvent::placeMetaCall (this=0x1298170, object=0x120d690) at kernel/qobject.cpp:484
#11 0x00007fd70aa70488 in QObject::event (this=0x120d690, e=0x1298170) at kernel/qobject.cpp:1110
#12 0x00007fd7099d98e1 in QWidget::event (this=0x120d690, event=0x1298170) at kernel/qwidget.cpp:7908
#13 0x00007fd70997be73 in QApplicationPrivate::notify_helper (this=0xf24f90, receiver=0x120d690, e=0x1298170) at kernel/qapplication.cpp:4051
#14 0x00007fd70997dd7a in QApplication::notify (this=0x7fff149ae820, receiver=0x120d690, e=0x1298170) at kernel/qapplication.cpp:4016
#15 0x00007fd70b6919a7 in KApplication::notify (this=0x7fff149ae820, receiver=0x120d690, event=0x1298170) at /home/e/kde/src/KDE/kdelibs/kdeui/kernel/kapplication.cpp:307
#16 0x00007fd70aa5c303 in QCoreApplication::notifyInternal (this=0x7fff149ae820, receiver=0x120d690, event=0x1298170) at kernel/qcoreapplication.cpp:593
#17 0x00007fd70aa5fdc7 in QCoreApplication::sendEvent (receiver=0x120d690, event=0x1298170) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:208
#18 0x00007fd70aa5c855 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xf0eef0) at kernel/qcoreapplication.cpp:1231
#19 0x00007fd70aa5ca2c in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1127
#20 0x00007fd70aa8b96b in QCoreApplication::sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#21 0x00007fd70aa8abac in postEventSourceDispatch (s=0xf27980) at kernel/qeventdispatcher_glib.cpp:204
#22 0x00007fd7061a1aa2 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#23 0x00007fd7061a521d in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#24 0x00007fd7061a53db in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#25 0x00007fd70aa89eee in QEventDispatcherGlib::processEvents (this=0xf14de0, flags={i = 345695840}) at kernel/qeventdispatcher_glib.cpp:318
#26 0x00007fd709a2300b in QGuiEventDispatcherGlib::processEvents (this=0xf14de0, flags={i = 345695936}) at kernel/qguieventdispatcher_glib.cpp:197
#27 0x00007fd70aa59587 in QEventLoop::processEvents (this=0x7fff149ae780, flags={i = 345696032}) at kernel/qeventloop.cpp:144
#28 0x00007fd70aa59794 in QEventLoop::exec (this=0x7fff149ae780, flags={i = 345696144}) at kernel/qeventloop.cpp:191
#29 0x00007fd70aa5cb4e in QCoreApplication::exec () at kernel/qcoreapplication.cpp:875
#30 0x00007fd70997bbd0 in QApplication::exec () at kernel/qapplication.cpp:3526
#31 0x0000000000412ab9 in main (argc=1, argv=0x7fff149aeb38) at /home/e/kde/src/KDE/kdebase/workspace/systemsettings/main.cpp:67