Although I'm still working on digesting the 'kernel bisection' I have
noticed several things. Firstly I've had four 'lockups' since 17 Jan,
none of which contain the  [drm:i915_hangcheck_elapsed] *ERROR*
Hangcheck timer elapsed... render ring idle issue. Secondly since 14 Jan
when I went back from the 3.14* kernel build to 3.13.0-44-generic I've
been seeing quite often in my syslog:

kernel: [ 1326.412487] [drm:intel_crtc_cursor_set_obj] cursor off
kernel: [ 1326.412493] [drm:g4x_check_srwm] SR watermark: display plane 92, 
cursor 2
kernel: [ 1326.412495] [drm:g4x_check_srwm] display watermark is too 
large(92/63), disabling
kernel: [ 1326.412497] [drm:intel_set_memory_cxsr] memory self-refresh is 
disabled
kernel: [ 1326.412499] [drm:g4x_update_wm] Setting FIFO watermarks - A: 
plane=40, cursor=2, B: plane=2, cursor=2, SR: plane=0, cursor=0

I might add that though the system 'appears' to be 'locked up' it is
only the video that is locked, however the mouse cursor will continue to
move, if that makes any sense. The system continues to fetch and process
mail with fetchmail and procmail, SpamAssassin and ClamAv continue to
run as well as scripts I have to report spam and so forth. Whether this
change will make any difference in this bug report I'm not sure however
I will continue to work on the kernel bisection as requested.

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https://bugs.launchpad.net/bugs/1402331

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

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