Try this PPA https://launchpad.net/~bryce/+archive/fig and reboot
Let me know if the system stops freezing after installing this or not,
and attach a fresh copy of your dmesg and /var/log/Xorg.0.log.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/767333
Title:
[i915gm] GPU lockup (ESR: 0x00000001 IPEHR: 0x02000011)
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