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[kang <1564759@xxxxxxxxxxxxxxxxxx>]

Note that I notice sluggishness (my 3y old intel 2D graphics - and CPU
rendered graphics on this computer are faster) and display freezes with
the fix and DRM enalbed, though this might need a separate bug (not sure
if its related or just another bug)

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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 Committed
Status in linux source package in Xenial:
  Fix Committed

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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