Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.4 (KDE 4.3.4)
Qt Version: 4.5.3
Operating System: Linux 2.6.30-2-amd64 x86_64
Distribution: Debian GNU/Linux testing (squeeze)

What I was doing when the application crashed:
KDE working perfectly on a debian-squeeze (testing) macbook. After upgrading installed packages and rebooting, I logged in and after the splash screen is displayed I can only see a black screen and a pop up window reports that plasma has crashed.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
The current source language is "auto; currently c".
[Current thread is 1 (Thread 0x7f8154ab1750 (LWP 3435))]

Thread 2 (Thread 0x7f812ffff910 (LWP 3439)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f81544e2499 in QWaitConditionPrivate::wait (this=0x22c7630, mutex=0x22c7628, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  QWaitCondition::wait (this=0x22c7630, mutex=0x22c7628, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:159
#3  0x00007f81508d13b4 in QHostInfoAgent::run (this=0x22c7610) at kernel/qhostinfo.cpp:260
#4  0x00007f81544e14a5 in QThreadPrivate::start (arg=0x22c7610) at thread/qthread_unix.cpp:188
#5  0x00007f815120d73a in start_thread (arg=<value optimized out>) at pthread_create.c:300
#6  0x00007f8151dd669d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8154ab1750 (LWP 3435)):
[KCrash Handler]
#5  0x00007f815452ecbe in QtPrivate::QStringList_contains (that=0x7fff0140a460, str=..., cs=Qt::CaseSensitive) at tools/qstringlist.cpp:318
#6  0x00007f8134a30b2f in HalPower::brightness(QString const&) () from /usr/lib/kde4/solid_hal_power.so
#7  0x00007f81377e5ca4 in Solid::Control::PowerManager::brightness (device=<value optimized out>) at ../../../../libs/solid/control/powermanager.cpp:198
#8  0x00007f813608991c in ?? () from /usr/lib/kde4/plasma_applet_battery.so
#9  0x00007f814be9f0e6 in Plasma::ExtenderPrivate::loadExtenderItems (this=0x219fbb0) at ../../plasma/extender.cpp:659
#10 0x00007f814bea019d in Extender (this=0x1f4e7e0, applet=<value optimized out>) at ../../plasma/extender.cpp:114
#11 0x00007f814be6575d in Plasma::Applet::extender (this=0x1f4d9d0) at ../../plasma/applet.cpp:688
#12 0x00007f813608cdb1 in ?? () from /usr/lib/kde4/plasma_applet_battery.so
#13 0x00007f814be8ba0a in Plasma::Corona::loadLayout (this=0x19d8c80, configName=<value optimized out>) at ../../plasma/corona.cpp:377
#14 0x00007f814be8cab2 in Plasma::Corona::initializeLayout (this=0x19d8c80, configName=...) at ../../plasma/corona.cpp:324
#15 0x00007f814942769a in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#16 0x00007f8149427828 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#17 0x00007f814942b96d in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
#18 0x00007f81545dbdf2 in QMetaObject::activate (sender=0x1a0ee80, from_signal_index=<value optimized out>, to_signal_index=4, argv=0x0) at kernel/qobject.cpp:3112
#19 0x00007f81545e0f5f in QSingleShotTimer::timerEvent (this=0x1a0ee80) at kernel/qtimer.cpp:298
#20 0x00007f81545d6353 in QObject::event (this=0x1a0ee80, e=0x24157d8) at kernel/qobject.cpp:1074
#21 0x00007f815254701d in QApplicationPrivate::notify_helper (this=0x1958020, receiver=0x1a0ee80, e=0x7fff0140bd00) at kernel/qapplication.cpp:4065
#22 0x00007f815254f07a in QApplication::notify (this=0x194ee10, receiver=0x1a0ee80, e=0x7fff0140bd00) at kernel/qapplication.cpp:4030
#23 0x00007f815319ee06 in KApplication::notify (this=0x194ee10, receiver=0x1a0ee80, event=0x7fff0140bd00) at ../../kdeui/kernel/kapplication.cpp:302
#24 0x00007f81545c6c9c in QCoreApplication::notifyInternal (this=0x194ee10, receiver=0x1a0ee80, event=0x7fff0140bd00) at kernel/qcoreapplication.cpp:610
#25 0x00007f81545f32c6 in QCoreApplication::sendEvent (this=0x195b4a0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:213
#26 QTimerInfoList::activateTimers (this=0x195b4a0) at kernel/qeventdispatcher_unix.cpp:580
#27 0x00007f81545ef634 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#28 0x00007f815145e13a in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#29 0x00007f8151461998 in ?? () from /lib/libglib-2.0.so.0
#30 0x00007f8151461b4c in g_main_context_iteration () from /lib/libglib-2.0.so.0
#31 0x00007f81545ef39c in QEventDispatcherGlib::processEvents (this=0x18c5850, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:407
#32 0x00007f81525ddf1f in QGuiEventDispatcherGlib::processEvents (this=0x24157c0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#33 0x00007f81545c5562 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#34 0x00007f81545c5934 in QEventLoop::exec (this=0x7fff0140bfb0, flags=...) at kernel/qeventloop.cpp:201
#35 0x00007f81545c7ba4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#36 0x00007f81494121fb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#37 0x0000000000406e9e in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x40a057 "0") at ../../kinit/kinit.cpp:677
#38 0x0000000000407aad in handle_launcher_request (sock=7, who=<value optimized out>) at ../../kinit/kinit.cpp:1169
#39 0x0000000000407f91 in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1362
#40 0x00000000004086c6 in main (argc=2, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1793
The current source language is "auto; currently asm".
The current source language is "auto; currently c".

Reported using DrKonqi