Application: systemsettings5 (5.2.2)

Qt Version: 5.4.1
Operating System: Linux 3.19.0-16-generic x86_64
Distribution: Ubuntu 15.04

-- Information about the crash:
- What I was doing when the application crashed:
I was looking for the settings to change my screen resolution
- Unusual behavior I noticed:
I can't find the screen resolution settings.
Ever since I updated Kubuntu my laptop has been acting slow and freezing up and my browser's images tear constantly. Changing graphics settings does not help.

-- Backtrace:
Application: System Settings (systemsettings5), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7ff72b21d780 (LWP 2075))]

Thread 2 (Thread 0x7ff71ba86700 (LWP 2078)):
#0  0x00007ff7279848dd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007ff725c9eb72 in ?? () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#2  0x00007ff725ca064f in xcb_wait_for_event () from /usr/lib/x86_64-linux-gnu/libxcb.so.1
#3  0x00007ff71e819099 in QXcbEventReader::run (this=0xc53930) at qxcbconnection.cpp:1105
#4  0x00007ff728005b0e in QThreadPrivate::start (arg=0xc53930) at thread/qthread_unix.cpp:337
#5  0x00007ff724bb86aa in start_thread (arg=0x7ff71ba86700) at pthread_create.c:333
#6  0x00007ff72798feed in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:109

Thread 1 (Thread 0x7ff72b21d780 (LWP 2075)):
[KCrash Handler]
#6  0x00007ff726a8dd6b in QQuickItemPrivate::addToDirtyList() () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#7  0x00007ff726a8de28 in QQuickItemPrivate::dirty(QQuickItemPrivate::DirtyType) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#8  0x00007ff726a98045 in ?? () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#9  0x00007ff72827573a in QObject::event (this=0x18722a0, e=<optimized out>) at kernel/qobject.cpp:1245
#10 0x00007ff726a96b6b in QQuickItem::event(QEvent*) () from /usr/lib/x86_64-linux-gnu/libQt5Quick.so.5
#11 0x00007ff72902fb2c in QApplicationPrivate::notify_helper (this=0xc3ae70, receiver=0x18722a0, e=0x7ff704108b50) at kernel/qapplication.cpp:3720
#12 0x00007ff729035000 in QApplication::notify (this=0x7ffc73ea8630, receiver=0x18722a0, e=0x7ff704108b50) at kernel/qapplication.cpp:3503
#13 0x00007ff728243c2b in QCoreApplication::notifyInternal (this=0x7ffc73ea8630, receiver=0x18722a0, event=event@entry=0x7ff704108b50) at kernel/qcoreapplication.cpp:935
#14 0x00007ff728245c9b in sendEvent (event=0x7ff704108b50, 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=0xc3a0c0) at kernel/qcoreapplication.cpp:1552
#16 0x00007ff728246298 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1410
#17 0x00007ff72829c843 in postEventSourceDispatch (s=0xc7ea60) at kernel/qeventdispatcher_glib.cpp:271
#18 0x00007ff724699c3d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#19 0x00007ff724699f20 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#20 0x00007ff724699fcc in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#21 0x00007ff72829cc57 in QEventDispatcherGlib::processEvents (this=0xc8a650, flags=...) at kernel/qeventdispatcher_glib.cpp:418
#22 0x00007ff7282413e2 in QEventLoop::exec (this=this@entry=0x7ffc73ea8510, flags=..., flags@entry=...) at kernel/qeventloop.cpp:204
#23 0x00007ff72824902c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1188
#24 0x00007ff728a6a31c in QGuiApplication::exec () at kernel/qguiapplication.cpp:1510
#25 0x00007ff72902b7a5 in QApplication::exec () at kernel/qapplication.cpp:2956
#26 0x000000000040eebc in main (argc=1, argv=<optimized out>) at ../../app/main.cpp:54

Reported using DrKonqi