[Bug 309796] [NEW] Kde4.2 beta 2 plasma workspace crash on login

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My system is Kubuntu 8.10 
I upgraded to KDE4.2 beta 2 from ppa.launchpad.net have now found that if I enable any of the nvidia drivers (177 or 173) I get the folloiwing as soon as the desktop is displayed:-

Application: Plasma Workspace (plasma), signal SIGABRT
0x00007fd9ff89a621 in nanosleep () from /lib/libc.so.6
[Current thread is 0 (LWP 6869)]

Thread 2 (Thread 0x40a29950 (LWP 6870)):
#0  0x00007fd9fd5b02d9 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/libpthread.so.0
#1  0x00007fda0037b349 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#2  0x00007fda03a3729c in ?? () from /usr/lib/libQtNetwork.so.4
#3  0x00007fda0037a362 in ?? () from /usr/lib/libQtCore.so.4
#4  0x00007fd9fd5ac3ea in start_thread () from /lib/libpthread.so.0
#5  0x00007fd9ff8d8c6d in clone () from /lib/libc.so.6
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fd9f9529730 (LWP 6869)):
[KCrash Handler]
#5  0x00007fd9ff824fd5 in raise () from /lib/libc.so.6
#6  0x00007fd9ff826b43 in abort () from /lib/libc.so.6
#7  0x00007fda003726b5 in qt_message_output () from /usr/lib/libQtCore.so.4
#8  0x00007fda003727fd in qFatal () from /usr/lib/libQtCore.so.4
#9  0x00007fda02dca378 in KConfigGroup::KConfigGroup () from /usr/lib/libkdecore.so.5
#10 0x00007fda047a07ab in Plasma::Theme::findInRectsCache () from /usr/lib/libplasma.so.3
#11 0x00007fda0479ad4c in Plasma::Svg::hasElement () from /usr/lib/libplasma.so.3
#12 0x00007fda0476e855 in Plasma::FrameSvg::setElementPrefix () from /usr/lib/libplasma.so.3
#13 0x00007fd9e80b28ee in ?? () from /usr/lib/kde4/plasma_applet_systemtray.so
#14 0x00007fda0473945d in Plasma::Applet::paint () from /usr/lib/libplasma.so.3
#15 0x00007fda01301165 in ?? () from /usr/lib/libQtGui.so.4
#16 0x00007fda01304988 in ?? () from /usr/lib/libQtGui.so.4
#17 0x00007fda01304dea in QGraphicsScene::drawItems () from /usr/lib/libQtGui.so.4
#18 0x00007fda01322fdb in QGraphicsView::paintEvent () from /usr/lib/libQtGui.so.4
#19 0x00007fda04abf306 in ?? () from /usr/lib/libkdeinit4_plasma.so
#20 0x00007fda00e20114 in QWidget::event () from /usr/lib/libQtGui.so.4
#21 0x00007fda0131d9bb in QGraphicsView::viewportEvent () from /usr/lib/libQtGui.so.4
#22 0x00007fda00462038 in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#23 0x00007fda00dcdc0c in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#24 0x00007fda00dd59ba in QApplication::notify () from /usr/lib/libQtGui.so.4
#25 0x00007fda033b5f0b in KApplication::notify () from /usr/lib/libkdeui.so.5
#26 0x00007fda00462d61 in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#27 0x00007fda00e1eb4f in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#28 0x00007fda00e1f232 in QWidgetPrivate::paintSiblingsRecursive () from /usr/lib/libQtGui.so.4
#29 0x00007fda00e1e808 in QWidgetPrivate::drawWidget () from /usr/lib/libQtGui.so.4
#30 0x00007fda00f78664 in ?? () from /usr/lib/libQtGui.so.4
#31 0x00007fda00f78a49 in ?? () from /usr/lib/libQtGui.so.4
#32 0x00007fda00e2b5ff in ?? () from /usr/lib/libQtGui.so.4
#33 0x00007fda00e38673 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#34 0x00007fda00e602c4 in ?? () from /usr/lib/libQtGui.so.4
#35 0x00007fd9fbbcad3b in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#36 0x00007fd9fbbce50d in ?? () from /usr/lib/libglib-2.0.so.0
#37 0x00007fd9fbbce6cb in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#38 0x00007fda0048b15f in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#39 0x00007fda00e5fa6f in ?? () from /usr/lib/libQtGui.so.4
#40 0x00007fda00461682 in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#41 0x00007fda0046180d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#42 0x00007fda00463cbd in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#43 0x00007fda04ab8603 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#44 0x00007fd9ff810466 in __libc_start_main () from /lib/libc.so.6
#45 0x00000000004007c9 in _start ()

without the nvidia drivers things appear work fine for me

** Affects: kdebase-workspace (Ubuntu)
     Importance: Undecided
         Status: New

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Kde4.2 beta 2 plasma workspace crash on login
https://bugs.launchpad.net/bugs/309796
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