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[Po-Hsu Lin <po-hsu.lin@xxxxxxxxxxxxx>]

Here is the dmesg output for 201409-15487 (BIOS A07) with cycling through all 4 modes,
with "drm.debug=14" added into GRUB_CMDLINE_LINUX_DEFAULT= of /etc/default/grub 

** Attachment added: "dmesg-drm-debug-201409-15487.log"
   https://bugs.launchpad.net/ubuntu/vivid/+source/linux/+bug/1483320/+attachment/4444004/+files/dmesg-latest.log

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

Title:
  Migrate Broadwell to use i915_bpo

Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Vivid:
  In Progress

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.

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