interesting detail: on certain machines with fglrx launching of the
mathematica frontend does not crash x11 immediately, also not upon exit.
but, after the frontend has been left opened for several hours, a simple
disturbance, like starting firefox, crashes the x11 and lightdm comes up
with the login request. what is even more interesting, logging in after
such a crash and starting the firefox again (no mathematica frontend
around anymore after the crash), this again, repeatedly crashes the x11.
logging in and starting firefox crashes x11 again and so long in
infinity. the only thing that clears this mess up is rebooting. i have
never before encountered such a bug in my life with linux. it seems that
mathematica does not break the x11 directly, but somehow corrupts some
system library, probably libc or even kernel itself...

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https://bugs.launchpad.net/bugs/1256561

Title:
  starting mathematica 9 crashes xserver

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