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** Branch linked: lp:ubuntu/trusty-proposed/linux-lts-vivid

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https://bugs.launchpad.net/bugs/1483320

Title:
  [BDW] VGA output regression on 4.2 (was: Migrate Broadwell to use
  i915_bpo)

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Vivid:
  Fix Committed

Bug description:
  There are several bugs affecting Broadwell generation graphics in the
  vivid kernel (3.19), but not found in 4.2rc which i915_bpo module is
  based on. In order to support our OEM partners (and other BDW users)
  it would make sense to migrate BDW to use i915_bpo instead.

  The known (public) bugs this would fix are:

  - screen is black after xrandr rotate command
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1446979

  - changing the VT causes flicker
  https://bugs.freedesktop.org/show_bug.cgi?id=85583
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1450557

  - GPU hangs on resume
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1468232
  (and dupes, which I believe there are several of)

  - and some OEM machines can't always hotplug the HDMI output (no
  public bug AIUI)

  the migration should not be too risky, since i915_bpo is already used
  for Braswell which is same generation as (=based on) BDW.

  UPDATE:

  Track VGA output regression here, found in 4.2 and fixed upstream by

  commit 6fa2d197936ba0b8936e813d0adecefac160062b
  Author: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@xxxxxxxxx>
  Date:   Mon Aug 31 11:23:28 2015 +0300

      i915: Set ddi_pll_sel in DP MST path

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