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["Yang Kun \(YK\)" <kun.yang@xxxxxxxxxxxxx>]

thank you Shengyao.

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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:
  Fix Released
Status in HWE Next trusty series:
  Fix Released
Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel-lts-trusty package in Ubuntu:
  Confirmed
Status in xserver-xorg-video-intel source package in Trusty:
  Fix Released
Status in xserver-xorg-video-intel-lts-trusty source package in Trusty:
  Confirmed

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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