Just in case this is useful I reverted the changes in that commit which affects 
two files:
drivers/gpu/drm/i915/i915_drv.c and
drivers/gpu/drm/i915/intel_fb.c

I thought originally it must be the changes in i915_drv so just reverted
those. This resulted in the system coming back from resume but I had to
do a VT switch to get the display back. The change to intel_fb is
exactly to say that we DON'T need a VT switch. Presumably my particular
chip DOES need it. Not sure where to go with this now...

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https://bugs.launchpad.net/bugs/1272945

Title:
  8086:2592 [Toshiba Portégé R200-126] Black screen/freeze after resume
  with i915

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