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[Kent Lin <1490035@xxxxxxxxxxxxxxxxxx>]

Test Kernel -27.29+bpo1 fixed the S3 resume display corruption issue
caused by Intel RC 1.4 code.

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https://bugs.launchpad.net/bugs/1490035

Title:
  [i915_bpo/SKL] Display corrupted after resume from suspend

Status in HWE Next:
  New
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  In Progress

Bug description:
  A new video BIOS code from Intel causes a regression on Skylake where
  the screen gets corrupted after resuming from suspend. This is a
  blocker for OEM's, since new BIOS releases will include this VBIOS.
  We've helped the vendor to verify a patch to fix it, and it's already
  been queued for 4.3:

  commit 39d9b85a4d4fa1642663ca0d208b5c246a3d6f50
  Author: Gary Wang <gary.c.wang@xxxxxxxxx>
  Date:   Fri Aug 28 16:40:34 2015 +0800

      drm/i915: set CDCLK if DPLL0 enabled during resuming from S3
      
      Since BIOS RC 1.4 it would enable CDCLK PLL during BIOS S3 resume, then
      driver needs to set CDCLK to avoid display corruption if DPLL0 enabled.
      
      References: https://bugs.freedesktop.org/show_bug.cgi?id=91697
      Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
      Reviewed-by: Damien Lespiau <damien.lespiau@xxxxxxxxx>
      Reviewed-by: Cooper Chiou <cooper.chiou@xxxxxxxxx>
      Reviewed-by: Wei Shun Chang <wei.shun.chang@xxxxxxxxx>
      Tested-by: Gary Wang <gary.c.wang@xxxxxxxxx>
      Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
      Cc: Gavin Hindman <gavin.hindman@xxxxxxxxx>
      Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
      Cc: Xiong Y Zhang <xiong.y.zhang@xxxxxxxxx>
      Signed-off-by: Gary Wang <gary.c.wang@xxxxxxxxx>
      Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>

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