Hi, i suffer from the same problem: backtrace with kdebase-runtime-dbg, kdebase-workspace-dbg and libxine1-dbg installed:

Application: System Settings (systemsettings), signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0x7fd0397eb6f0 (LWP 13734)]
[New Thread 0x40ac7950 (LWP 13743)]
[KCrash handler]
#5  0x00007fd036ec8fd5 in raise () from /lib/libc.so.6
#6  0x00007fd036ecab43 in abort () from /lib/libc.so.6
#7  0x00007fd0380cd6b5 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007fd0380cd7fd in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007fd02b0ab0e8 in Phonon::AudioDevicePrivate::uniqueIdentifierFromDevice (this=<value optimized out>, device=<value optimized out>)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/libkaudiodevicelist/audiodevice.cpp:87
#10 0x00007fd02b0ab6b7 in AudioDevice (this=0x7fff41828330, audioDevice=
        {d = {d = 0x7fff41828320}}, config={d = 0x7fff41828310})
    at /build/buildd/kdebase-runtime-4.1.2/phonon/libkaudiodevicelist/audiodevice.cpp:132
#11 0x00007fd02b0b3b4d in Phonon::AudioDeviceEnumeratorPrivate::findDevices (
    this=0x1c8e430)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/libkaudiodevicelist/audiodeviceenumerator.cpp:101
#12 0x00007fd02b0b4560 in AudioDeviceEnumeratorPrivate (this=0x1c8e430)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/libkaudiodevicelist/audiodeviceenumerator.cpp:53
#13 0x00007fd02b0b4842 in Phonon::AudioDeviceEnumerator::self ()
    at /build/buildd/kdebase-runtime-4.1.2/phonon/libkaudiodevicelist/audiodeviceenumerator.cpp:42
#14 0x00007fd02a96ca75 in DeviceListing (this=0x1bfb400)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/platform_kde/devicelisting.cpp:189
#15 0x00007fd02a966ec5 in Phonon::KdePlatformPlugin::ensureDeviceListingObject
    (this=0x1c85f90)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/platform_kde/kdepluginfactory.cpp:264
#16 0x00007fd02a966fb7 in Phonon::KdePlatformPlugin::objectDescriptionIndexes
    (this=0x1c85f90, type=6)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/platform_kde/kdepluginfactory.cpp:275
#17 0x00007fd02b2dea89 in Phonon::GlobalConfig::audioOutputDeviceListFor (
    this=<value optimized out>, category=Phonon::NoCategory, 
    override=<value optimized out>)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/kcm/globalconfig.cpp:137
#18 0x00007fd02b2d0e04 in DevicePreference::availableAudioOutputDevices (
    this=<value optimized out>)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/kcm/devicepreference.cpp:382
#19 0x00007fd02b2d2264 in DevicePreference::on_showCheckBox_toggled (
    this=0x1c543e0)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/kcm/devicepreference.cpp:696
#20 0x00007fd02b2d63f0 in DevicePreference::qt_metacall (this=0x1c543e0, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=<value optimized out>)
    at /build/buildd/kdebase-runtime-4.1.2/obj-x86_64-linux-gnu/phonon/kcm/moc_devicepreference.cpp:88
#21 0x00007fd0381d2134 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#22 0x00007fd037c666c2 in QAbstractButton::toggled ()
   from /usr/lib/libQtGui.so.4
#23 0x00007fd0379ec746 in QAbstractButton::setChecked ()
   from /usr/lib/libQtGui.so.4
#24 0x00007fd02b2d3d60 in DevicePreference::load (this=0x1c543e0)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/kcm/devicepreference.cpp:409
#25 0x00007fd02b2cc5ad in PhononKcm::load (this=0x1bc75f0)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/kcm/main.cpp:63
#26 0x00007fd02b2ccc63 in PhononKcm (this=0x1bc75f0, 
    parent=<value optimized out>, args=<value optimized out>)
    at /build/buildd/kdebase-runtime-4.1.2/phonon/kcm/main.cpp:55
#27 0x00007fd02b2cd743 in KPluginFactory::createInstance<PhononKcm, QWidget> (
    parentWidget=<value optimized out>, parent=<value optimized out>, 
    args=@0x7fff41829930) at /usr/include/kpluginfactory.h:461
#28 0x00007fd03868b695 in KPluginFactory::create (this=0x1674bc0, 
    iface=0x7fd038c6dde0 "KCModule", parentWidget=0x0, parent=0x1bc3760, 
    args=@0x7fff41829930, keyword=@0x7fff41829650)
    at /build/buildd/kde4libs-4.1.2/kdecore/util/kpluginfactory.cpp:189
#29 0x00007fd038f14576 in KService::createInstance<KCModule> (
    service=<value optimized out>, parent=0x1bc3760, args=@0x7fff41829930, 
    error=0x7fff41829940)
    at /build/buildd/kde4libs-4.1.2/kdecore/util/kpluginfactory.h:515
#30 0x00007fd038f135c4 in KCModuleLoader::loadModule (mod=@0x1bc67b0, 
    report=KCModuleLoader::Inline, parent=0x1bc3760, args=@0x1bc6780)
    at /build/buildd/kde4libs-4.1.2/kutils/kcmoduleloader.cpp:90
#31 0x00007fd038f191ea in KCModuleProxyPrivate::loadModule (this=0x1bc6780)
    at /build/buildd/kde4libs-4.1.2/kutils/kcmoduleproxy.cpp:107
#32 0x00007fd038f1a1d5 in KCModuleProxy::realModule (
    this=<value optimized out>)
    at /build/buildd/kde4libs-4.1.2/kutils/kcmoduleproxy.cpp:83
#33 0x00007fd038f1a1e9 in KCModuleProxy::minimumSizeHint (this=0x35a6)
    at /build/buildd/kde4libs-4.1.2/kutils/kcmoduleproxy.cpp:346
#34 0x00007fd03770cce3 in qSmartMinSize () from /usr/lib/libQtGui.so.4
#35 0x00007fd037abe2f6 in ?? () from /usr/lib/libQtGui.so.4
#36 0x00007fd037abe7d6 in QScrollArea::setWidget ()
   from /usr/lib/libQtGui.so.4
#37 0x00000000004104a3 in KCMultiWidget::addModule (this=0x1a9f7f0, 
    moduleinfo=@0x17a4650)
    at /build/buildd/kdebase-workspace-4.1.2/systemsettings/kcmultiwidget.cpp:177
#38 0x0000000000415bc1 in MainWindow::selectionChanged (this=0x16c3bd0, 
    selected=<value optimized out>)
    at /build/buildd/kdebase-workspace-4.1.2/systemsettings/mainwindow.cpp:356
#39 0x0000000000415d1d in MainWindow::qt_metacall (this=0x16c3bd0, 
    _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff4182a750)
    at /build/buildd/kdebase-workspace-4.1.2/obj-x86_64-linux-gnu/systemsettings/mainwindow.moc:70
#40 0x00007fd0381d2134 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#41 0x00007fd037b48895 in QAbstractItemView::activated ()
   from /usr/lib/libQtGui.so.4
#42 0x00007fd037b5549e in QAbstractItemView::mouseReleaseEvent ()
   from /usr/lib/libQtGui.so.4
#43 0x00007fd037b69847 in QListView::mouseReleaseEvent ()
   from /usr/lib/libQtGui.so.4
#44 0x00007fd038b07088 in KCategorizedView::mouseReleaseEvent (this=0x35a6, 
    event=0x35a6)
    at /build/buildd/kde4libs-4.1.2/kdeui/itemviews/kcategorizedview.cpp:1135
#45 0x00007fd037732359 in QWidget::event () from /usr/lib/libQtGui.so.4
#46 0x00007fd037b578ad in QAbstractItemView::viewportEvent ()
   from /usr/lib/libQtGui.so.4
#47 0x00007fd0381bd038 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#48 0x00007fd0376dfc0c in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#49 0x00007fd0376e825a in QApplication::notify () from /usr/lib/libQtGui.so.4
#50 0x00007fd038b19b8b in KApplication::notify (this=0x7fff4182c3d0, 
    receiver=0x1829570, event=0x7fff4182b5a0)
    at /build/buildd/kde4libs-4.1.2/kdeui/kernel/kapplication.cpp:311
#51 0x00007fd0381bdd61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#52 0x00007fd0376e75f8 in QApplicationPrivate::sendMouseEvent ()
   from /usr/lib/libQtGui.so.4
#53 0x00007fd03774bc19 in ?? () from /usr/lib/libQtGui.so.4
#54 0x00007fd03774a637 in QApplication::x11ProcessEvent ()
   from /usr/lib/libQtGui.so.4
#55 0x00007fd0377722f4 in ?? () from /usr/lib/libQtGui.so.4
#56 0x00007fd033c9ed3b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#57 0x00007fd033ca250d in ?? () from /usr/lib/libglib-2.0.so.0
#58 0x00007fd033ca26cb in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#59 0x00007fd0381e615f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#60 0x00007fd037771a9f in ?? () from /usr/lib/libQtGui.so.4
#61 0x00007fd0381bc682 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#62 0x00007fd0381bc80d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#63 0x00007fd0381becbd in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#64 0x0000000000411b66 in main (argc=1, argv=0x7fff4182c808)
    at /build/buildd/kdebase-workspace-4.1.2/systemsettings/main.cpp:67
#0  0x00007fd036f3e621 in nanosleep () from /lib/libc.so.6