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[Woodrow Shen <woodrow.shen@xxxxxxxxxxxxx>]

This is a simple patch to fix this issue for sna / uxa mode and tested
on UMA / discrete card.

** Patch added: "fix-no-backlight.patch"
   https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1373776/+attachment/4245974/+files/fix-no-backlight.patch

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https://bugs.launchpad.net/bugs/1373776

Title:
  internal panel brightness set to 0 when switching back to internal-
  only mode

Status in HWE Next Project:
  New
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Fix Released
Status in “xserver-xorg-video-intel” source package in Trusty:
  In Progress

Bug description:
  [Impact]

  the brightness of the internal panel can get set to the lowest value
  when going through the display modes and back to internal-only mode

  this is fixed in a later upstream release, but that can't be
  backported so a distro patch is needed

  [Test case]

  use the laptop hotkey to switch between modes until you get a blank
  internal panel

  [Regression potential]

  slim, the patch is simple enough

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