.
Thread 2 (Thread 2480):
#0  0x00007f78ce7876cc in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/libpthread.so.0
No symbol table info available.
#1  0x00007f78cea1366b in QWaitCondition::wait(QMutex*, unsigned long) ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#2  0x00007f78cb9d907c in ?? () from /usr/lib/libQtNetwork.so.4
No symbol table info available.
#3  0x00007f78cea126b5 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#4  0x00007f78ce782b14 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#5  0x00007f78d22a6fbd in clone () from /lib/libc.so.6
No symbol table info available.
#6  0x0000000000000000 in ?? ()
No symbol table info available.
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Thread 1 (Thread 2477):
#0  0x00007f78cea6360d in QtPrivate::QStringList_contains(QStringList const*, QString const&, Qt::CaseSensitivity) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#1  0x00007f78b0750366 in HalPower::brightness(QString const&) ()
   from /usr/lib/kde4/solid_hal_power.so
No symbol table info available.
#2  0x00007f78b3b3859c in Solid::Control::PowerManager::brightness(QString const&) () from /usr/lib/libsolidcontrol.so.4
No symbol table info available.
#3  0x00007f78b25a1ea2 in ?? () from /usr/lib/kde4/plasma_applet_battery.so
No symbol table info available.
#4  0x00007f78d1e18a16 in ?? () from /usr/lib/libplasma.so.3
No symbol table info available.
#5  0x00007f78d1e1a002 in Plasma::Extender::Extender(Plasma::Applet*) ()
   from /usr/lib/libplasma.so.3
No symbol table info available.
#6  0x00007f78d1dccf45 in Plasma::Applet::extender() const ()
   from /usr/lib/libplasma.so.3
No symbol table info available.
#7  0x00007f78b25a6ef0 in ?? () from /usr/lib/kde4/plasma_applet_battery.so
No symbol table info available.
#8  0x00007f78d1dfda27 in Plasma::Corona::loadLayout(QString const&) ()
   from /usr/lib/libplasma.so.3
No symbol table info available.
#9  0x00007f78d1dfe4e2 in Plasma::Corona::initializeLayout(QString const&) ()
   from /usr/lib/libplasma.so.3
No symbol table info available.
#10 0x00007f78d25913a8 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
No symbol table info available.
#11 0x00007f78d25916a8 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
No symbol table info available.
#12 0x00007f78d2591ec2 in ?? () from /usr/lib/libkdeinit4_plasma-desktop.so
No symbol table info available.
#13 0x00007f78ceb18833 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#14 0x00007f78ceb200cf in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#15 0x00007f78ceb154a3 in QObject::event(QEvent*) ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#16 0x00007f78cf24ff2c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
No symbol table info available.
#17 0x00007f78cf25653d in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#18 0x00007f78d03f57c6 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libkdeui.so.5
No symbol table info available.
#19 0x00007f78ceb05abc in QCoreApplication::notifyInternal(QObject*, QEvent*)
    () from /usr/lib/libQtCore.so.4
No symbol table info available.
#20 0x00007f78ceb327a2 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#21 0x00007f78ceb2f364 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#22 0x00007f78c80cdd4e in g_main_context_dispatch ()
   from /lib/libglib-2.0.so.0
No symbol table info available.
#23 0x00007f78c80d1718 in ?? () from /lib/libglib-2.0.so.0
No symbol table info available.
#24 0x00007f78c80d1840 in g_main_context_iteration ()
   from /lib/libglib-2.0.so.0
No symbol table info available.
#25 0x00007f78ceb2f053 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#26 0x00007f78cf2fe3de in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#27 0x00007f78ceb043e2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#28 0x00007f78ceb047bc in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#29 0x00007f78ceb084fb in QCoreApplication::exec() ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#30 0x00007f78d257ad12 in kdemain ()
   from /usr/lib/libkdeinit4_plasma-desktop.so
No symbol table info available.
#31 0x00007f78d21e1c4d in __libc_start_main () from /lib/libc.so.6
No symbol table info available.
#32 0x0000000000400689 in _start ()
No symbol table info available.