It's ~90% a bug in libEGL_nvidia, i don't have any real function names, but the 
assembler code is clear.. at least for my AI xD. I can reproduce the same 
freeze with exactly the same code path by calling libEGl functions a bit 
"delayed/off" with gdm stopped. From what I understand it is a issue with dual 
monitors and a wrong infinite wait bc. one of the crts is "laggy". I got some 
other topics now, but I'll come back to you for tests.
Cheers

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https://bugs.launchpad.net/bugs/2147648

Title:
   gnome-shell freeze: NVIDIA EGL deadlock in eglSwapBuffers triggered
  by notification damage rects

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