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[Myemailu <1564759@xxxxxxxxxxxxxxxxxx>]

I can confirm that the patch in comment 28 (Use WaRsDisableCoarsePowerGating)
solved the issue on my Intel NUC6i5 with only a moderate increase in power consumption.

With an idle desktop using kernel 4.6.0-rc3, the system consumes:

7 Watts without patch, RC6 enabled, frequent crashes
17 Watts with i915.enable_rc6=0, no crashes
9 Watts with patch, no crashes

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https://bugs.launchpad.net/bugs/1564759

Title:
  [i915_bpo] Fix RC6 on SKL GT3 & GT4

Status in DRI:
  Incomplete
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  Runtime power management causes GPU hangs on SKL GT3 & GT4 ("Iris" &
  "Iris Pro"), so fix it by adding two patches to extend certain
  workarounds to cover all chip revisions.

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