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

Note, on 201408-15387, all four display modes (extended, mirrored...)
are working well with both HDMI and DP output.

And the detailed hardware information for the VGA controller is:
00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 08) (prog-if 00 [VGA controller])
        Subsystem: Dell Device [1028:062d]
        Flags: bus master, fast devsel, latency 0, IRQ 45
        Memory at f6000000 (64-bit, non-prefetchable) [size=16M]
        Memory at e0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f000 [size=64]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: <access denied>
        Kernel driver in use: i915

The resolution on this laptop is 1920*1080

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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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