Public bug reported:

A boot up gfx regression (blank display) has been identified on a
machine being certified caused by the recent addition of DDI-E support
(VGA out). One patch of the series was still being debated at the time
of the SRU cutoff date, but got included because it was on the set of
commits that got tested on a number of systems. We can revert the
current patch and revisit it later once upstream has a proper solution
for it.

commit b6fabc6e37462687296b60262edff5b75a50aff4
Author: Rodrigo Vivi <rodrigo.v...@intel.com>
Date:   Fri Aug 7 17:33:42 2015 -0700

    UBUNTU: SAUCE: i915_bpo: drm/i915/skl: DDI-E and DDI-A shares 4
lanes.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Vivid)
     Importance: Undecided
         Status: New

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1490038

Title:
  [i915_bpo] Adding DDI-E support caused a boot up gfx regression

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