Well, it lasted a bit over two days this time, just experienced another lockup 
Jan 17 20:14:43 localhost kernel: [214866.808010] [drm:i915_hangcheck_elapsed] 
*ERROR* Hangcheck timer elapsed... render ring idle
This is after updating to the A15 BIOS on my Dell 780



** Attachment added: "lshw output after upgrading BIOS to A15"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1402331/+attachment/4300896/+files/lshw011715.txt

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Title:
  System will periodically lockup with [drm:i915_hangcheck_elapsed]
  *ERROR* Hangcheck timer elapsed... render ring idle

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