Created attachment 58127 [details] this is the backtrace Version: 4.6 (using KDE 4.6.0) OS: Linux after changing the kwin setings the plasma work space goes out for a minute and then restarts the plasma work space Reproducible: Sometimes Steps to Reproduce: enabling the desktop effects in kde Actual Results: it crashed and then restarted after Expected Results: it should of have displayed a error message saying the the desktop effects are not compatible with your graphics card
KWin tries best to detect features of the video drivers. It can, however, not prevent crashes when there are bugs in the drivers. Please report the bug to https://bugs.freedesktop.org/
a) the backtrace is of little use because it lacks important informations about what code was called inside kwin b) if however results in #7 0xb3910ab7 in xcb_glx_get_string_string_length () from /usr/lib/libxcb-glx.so.0 #8 0xb6ac1da4 in ?? () from /usr/lib/libGL.so.1 #9 0xb6aa5b34 in ?? () from /usr/lib/libGL.so.1 #10 0xb6aa316f in glXMakeCurrentReadSGI () from /usr/lib/libGL.so.1 #11 0xb6aa3303 in glXMakeCurrent () from /usr/lib/libGL.so.1 what means it's a driver bug c) for any kind of further assistance we'd need at least to know your GPU/Driver configuration (you likely wish to upgrade Mesa or try "export LIBGL_ALWAYS_INDIRECT=1" d) This should* happen only once, from now on kwin will likely know about your driver issue and do not attempt to activate compositing w/o further explicit actions. *but since it's not possible to precisely say where the crash occurs, this can't be said for sure.
forgot to tag the bug...