I have a similar problem. After waking up from suspend (i.e., after
opening the lid), I can log in via the Gnome-Shell "Locked Screen", and
after a few seconds find myself back in LightDM. It doesn't happen every
time ... usually after I have closed and opened the lid several times.
It seems that it crashes more often after the lid was closed for a
longer time (i.e. not only seconds). When I open the notebook in the
morning (after being suspended for ~7 hours) , it always crashes.

I'm on a Thinkpad T430s. 
Ubuntu 12.04, Kernel 3.50, Gnome-Shell. 

The error I get in apport is

"Xorg crashed with SIGSEGV in XIChangeDeviceProperty()",
the package is xserver-xorg-core.

I'd like to attach the log, but I don't know how to do this. :-)

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https://bugs.launchpad.net/bugs/598567

Title:
  Xorg crashed with SIGSEGV in XIChangeDeviceProperty() on resume from
  suspend to ram - synaptics_drv error

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