The steps I do to reproduce it are:

- Boot up Ubuntu, log in to Gnome shell via LightDM.
- Close the lid of the notebook.
- Wait. (*)
- Open the lid of the notebook.
- Log in via the "locked screen" login prompt.
==> After a ~5-10 seconds I'll find myself back in LightDM, on the next login I 
get the error report telling me about the SIGSEGV in XIGetDeviceProperty().

(*) It seems that opening the lid directly after closing it does not
trigger the problem. But when the lid was closed over a few hours, it
happens pretty much every time.

What kind of information do you need from me?
I have a Lenovo Thinkpad T430s with the new i5 Ivy Bridge architecture. Ubuntu 
12.04, Kernel 3.50, Gnome Shell (but the behaviour was the same in Unity). I 
can provide more information if you need it.

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https://bugs.launchpad.net/bugs/956071

Title:
  Xorg crashed with SIGSEGV in XIGetDeviceProperty()

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