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[Launchpad Bug Tracker <1374389@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/linux-keystone

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https://bugs.launchpad.net/bugs/1374389

Title:
  [i915_bdw] Backported bugfixes

Status in “linux” package in Ubuntu:
  Invalid
Status in “linux” source package in Trusty:
  Fix Committed

Bug description:
  This set of backports fixes some issues in i915_bdw:

  drm/i915/bdw: Remove BDW preproduction W/As until C stepping.
  drm/i915: Add the WaCsStallBeforeStateCacheInvalidate:bdw workaround.
  drm/i915: Refactor Broadwell PIPE_CONTROL emission into a helper.
  drm/i915: Replace hardcoded cacheline size with macro
  drm/i915/bdw: Cleanup pre prod workarounds
  drm/i915/bdw: Apply workarounds in render ring init function
  drm/i915: call lpt_init_clock_gating on BDW too
  drm/i915/bdw: Disable idle DOP clock gating
  drm/i915/bdw: 3D_CHICKEN3 has write mask bits
  drm/i915: add null render states for gen6, gen7 and gen8
  - Add new workarounds and remove those that cause issues on production HW
  - Also makes sure the WA's are applied on GPU reset, suspend & resume et al
  - fixes various cases when the GPU can get hung

  drm/i915: respect the VBT minimum backlight brightness
  drm/i915: extract backlight minimum brightness from VBT
  drm/i915: shuffle panel code
  - fix a bug where changing the panel brightness to lowest value actually turns the panel off

  drm/i915/bdw: Add 42ms delay for IPS disable
  - fix the panel getting confused and corrupt when changing resolutions back and forth

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