Application: systemsettings5 (5.4.1)
 (Compiled from sources)
Qt Version: 5.4.2
Operating System: Linux 4.2.0-16-generic x86_64
Distribution: Ubuntu 15.10

-- Information about the crash:
- What I was doing when the application crashed:

i have a bug when i try to use the second monitor like principal one 
nvidia 8600M GS 



- Custom settings of the application:

display and monitoring

manage and cofigurer the screens

configuration of the display

main display

The crash can be reproduced every time.

-- Backtrace:
Application: Configuration du système (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f035ea35800 (LWP 5945))]

Thread 3 (Thread 0x7f0323675700 (LWP 5953)):
#0  0x00007f035b1d08dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007f035814c1ec in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f035814c2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f035814c339 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0358172965 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f035866b6aa in start_thread (arg=0x7f0323675700) at pthread_create.c:333
#6  0x00007f035b1dbeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 2 (Thread 0x7f0322e74700 (LWP 5954)):
#0  0x00007f0358190884 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007f035814ba59 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f035814c167 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f035814c572 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f0348d6d4c6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#5  0x00007f0358172965 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f035866b6aa in start_thread (arg=0x7f0322e74700) at pthread_create.c:333
#7  0x00007f035b1dbeed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7f035ea35800 (LWP 5945)):
[KCrash Handler]
#6  0x00007f035a5286d0 in QQuickWindow::maybeUpdate() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007f035a515053 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007f035a51f935 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007f035bad4651 in QObject::event (this=0x131ed10, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007f035a51f10b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007f035cf26b8c in QApplicationPrivate::notify_helper (this=this@entry=0x8736f0, receiver=receiver@entry=0x131ed10, e=e@entry=0x7f03241a0dd0) at kernel/qapplication.cpp:3720
#12 0x00007f035cf2c230 in QApplication::notify (this=0x7ffe290837d0, receiver=0x131ed10, e=0x7f03241a0dd0) at kernel/qapplication.cpp:3503
#13 0x00007f035baa2f1b in QCoreApplication::notifyInternal (this=0x7ffe290837d0, receiver=0x131ed10, event=event@entry=0x7f03241a0dd0) at kernel/qcoreapplication.cpp:935
#14 0x00007f035baa5057 in QCoreApplication::sendEvent (event=0x7f03241a0dd0, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:228
#15 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x872d30) at kernel/qcoreapplication.cpp:1552
#16 0x00007f035baa5588 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#17 0x00007f035baf9e73 in postEventSourceDispatch (s=0x92e140) at kernel/qeventdispatcher_glib.cpp:271
#18 0x00007f035814bff7 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007f035814c250 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007f035814c2fc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007f035bafa27f in QEventDispatcherGlib::processEvents (this=0x952260, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007f035baa075a in QEventLoop::exec (this=this@entry=0x7ffe290836b0, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007f035baa82cc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#24 0x00007f035c97300c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#25 0x00007f035cf23025 in QApplication::exec () at kernel/qapplication.cpp:2956
#26 0x000000000040f04b in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:55

Possible duplicates by query: bug 352905, bug 352774, bug 352402, bug 351926, bug 351786.

Reported using DrKonqi