Do you remember doing a vt switch at some point? The X log says
'setversion 1.4 failed' at some point, meaning it lost drm master for
some reason, maybe the i915 kernel module died
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1208986
Title:
Xorg crashed with SIGSEGV in __mpn_divrem()
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