Version:            (using KDE 4.1.2)
OS:                Linux
Installed from:    Ubuntu Packages

Hi!

Every time after logging in the screen goes dark (but the mouse pointer does stay visible about 2sec) and afterwards the whole picture is upside down and mirrored (but the mouse pointer does follow the way as I am moving the mouse). This state lasts for about 30sec. Then the screen goes dark again. After a short waiting period everything is fine.

At this time I get a report from the KDE Crash Handler saying:
Application: KWin (kwin), signal SIGSEGV
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0x7f4d3ed96730 (LWP 6147)]
[KCrash handler]
#5  0x00007f4d37c1f2d6 in ?? () from /usr/lib/libGLcore.so.1
#6  0x00007f4d37c1f8d1 in ?? () from /usr/lib/libGLcore.so.1
#7  0x00007f4d379a8a88 in ?? () from /usr/lib/libGLcore.so.1
#8  0x00007f4d379ff8a5 in ?? () from /usr/lib/libGLcore.so.1
#9  0x00007f4d37d27166 in ?? () from /usr/lib/libGLcore.so.1
#10 0x00007f4d379a4a66 in ?? () from /usr/lib/libGLcore.so.1
#11 0x00007f4d3e321e20 in KWin::GLRenderTarget::enable ()
   from /usr/lib/libkwineffects.so.1
#12 0x00007f4d3eb4dac8 in ?? () from /usr/lib/libkdeinit4_kwin.so
#13 0x00007f4d33dd6c1f in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#14 0x00007f4d33dd71d9 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#15 0x00007f4d33dd72ff in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#16 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#17 0x00007f4d33dcd6fb in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#18 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#19 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#20 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#21 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#22 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#23 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#24 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#25 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#26 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#27 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#28 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#29 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#30 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#31 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#32 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#33 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#34 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#35 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#36 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#37 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#38 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#39 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#40 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#41 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#42 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#43 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#44 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#45 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#46 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#47 0x00007f4d3e319e8b in KWin::Effect::drawWindow ()
   from /usr/lib/libkwineffects.so.1
#48 0x00007f4d3eb4fe55 in ?? () from /usr/lib/libkdeinit4_kwin.so
#49 0x00007f4d3eb3d87b in ?? () from /usr/lib/libkdeinit4_kwin.so
#50 0x00007f4d3eb4ff0e in ?? () from /usr/lib/libkdeinit4_kwin.so
#51 0x00007f4d3e319f1b in KWin::Effect::paintWindow ()
   from /usr/lib/libkwineffects.so.1
#52 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#53 0x00007f4d3e319f1b in KWin::Effect::paintWindow ()
   from /usr/lib/libkwineffects.so.1
#54 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#55 0x00007f4d3e319f1b in KWin::Effect::paintWindow ()
   from /usr/lib/libkwineffects.so.1
#56 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#57 0x00007f4d33dbdbc9 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#58 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#59 0x00007f4d33db0be0 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#60 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#61 0x00007f4d33db3dcf in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#62 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#63 0x00007f4d33dc786c in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#64 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#65 0x00007f4d33daef68 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#66 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#67 0x00007f4d33dbbaf7 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#68 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#69 0x00007f4d33dd9595 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#70 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#71 0x00007f4d33db90ff in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#72 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#73 0x00007f4d33deb0f7 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#74 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#75 0x00007f4d33db88eb in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#76 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#77 0x00007f4d33db8301 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#78 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#79 0x00007f4d3e319f1b in KWin::Effect::paintWindow ()
   from /usr/lib/libkwineffects.so.1
#80 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#81 0x00007f4d33db21bb in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#82 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#83 0x00007f4d33dd284c in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#84 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#85 0x00007f4d3e319f1b in KWin::Effect::paintWindow ()
   from /usr/lib/libkwineffects.so.1
#86 0x00007f4d3eb4ffa5 in ?? () from /usr/lib/libkdeinit4_kwin.so
#87 0x00007f4d3eb3eca9 in ?? () from /usr/lib/libkdeinit4_kwin.so
#88 0x00007f4d3eb3e63e in ?? () from /usr/lib/libkdeinit4_kwin.so
#89 0x00007f4d3eb3d93f in ?? () from /usr/lib/libkdeinit4_kwin.so
#90 0x00007f4d3eb50054 in ?? () from /usr/lib/libkdeinit4_kwin.so
#91 0x00007f4d33de6a4e in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#92 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#93 0x00007f4d33dd75b9 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#94 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#95 0x00007f4d33dcd5d4 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#96 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#97 0x00007f4d33dbc925 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#98 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#99 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#100 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#101 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#102 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#103 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#104 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#105 0x00007f4d33db0436 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#106 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#107 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#108 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#109 0x00007f4d33ddaefd in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#110 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#111 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#112 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#113 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#114 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#115 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#116 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#117 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#118 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#119 0x00007f4d33de7935 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#120 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#121 0x00007f4d33db22c1 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#122 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#123 0x00007f4d3e319fa0 in KWin::Effect::paintScreen ()
   from /usr/lib/libkwineffects.so.1
#124 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#125 0x00007f4d33dd6185 in ?? () from /usr/lib/kde4/kwin4_effect_builtins.so
#126 0x00007f4d3eb500e0 in ?? () from /usr/lib/libkdeinit4_kwin.so
#127 0x00007f4d3eb3eee4 in ?? () from /usr/lib/libkdeinit4_kwin.so
#128 0x00007f4d3eb49254 in ?? () from /usr/lib/libkdeinit4_kwin.so
#129 0x00007f4d3eb3b154 in ?? () from /usr/lib/libkdeinit4_kwin.so
#130 0x00007f4d3eadf6b2 in ?? () from /usr/lib/libkdeinit4_kwin.so
#131 0x00007f4d3dbde134 in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
#132 0x00007f4d3dbd8a43 in QObject::event () from /usr/lib/libQtCore.so.4
#133 0x00007f4d3c7adc3d in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
#134 0x00007f4d3c7b59ea in QApplication::notify () from /usr/lib/libQtGui.so.4
#135 0x00007f4d3b57eb8b in KApplication::notify (this=0x7fff46f92480, 
    receiver=0x6c9178, event=0x7fff46f92110)
    at /build/buildd/kde4libs-4.1.2/kdeui/kernel/kapplication.cpp:311
#136 0x00007f4d3dbc9d61 in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
#137 0x00007f4d3dbf5ab6 in ?? () from /usr/lib/libQtCore.so.4
#138 0x00007f4d3dbf21fd in ?? () from /usr/lib/libQtCore.so.4
#139 0x00007f4d3a087d3b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#140 0x00007f4d3a08b50d in ?? () from /usr/lib/libglib-2.0.so.0
#141 0x00007f4d3a08b6cb in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#142 0x00007f4d3dbf215f in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
#143 0x00007f4d3c83fa9f in ?? () from /usr/lib/libQtGui.so.4
#144 0x00007f4d3dbc8682 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
#145 0x00007f4d3dbc880d in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#146 0x00007f4d3dbcacbd in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
#147 0x00007f4d3eaf8731 in kdemain () from /usr/lib/libkdeinit4_kwin.so
#148 0x00007f4d3e765466 in __libc_start_main () from /lib/libc.so.6
#149 0x0000000000400659 in _start ()
#0  0x00007f4d3e7ef5f0 in __nanosleep_nocancel () from /lib/libc.so.6


I am using a NVidia 9600GT with the NVidia nonfree drivers (version 177.80) on a 64bit Kubuntu.