Raúl Sánchez Siles has a good lead on this in the fd.o bug 11432, 
https://bugs.freedesktop.org/show_bug.cgi?id=11432

He's working around the crash by forcing PipeA to be enabled, without an
external screen attached. This is a step in the right direction to
debugging the issue. We may be able to get a better solution still by
identifying where this specific crash occurs, and either enabling PIpeA
for that portion of code, or avoiding that code-path when PipeA is
disabled.

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xserver-xorg-video-intel hangs the system when laptop lid is closed
https://bugs.launchpad.net/bugs/138256
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