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[Shengyao Xue <1373776@xxxxxxxxxxxxxxxxxx>]

I can reproduce this issue on a laptop, and the new version ca fix this
issue.

my original env are:
OS: Ubuntu 12.04
Kernel: linux-image-3.13.0-40-generic
Package: xserver-xorg-video-intel-lts-trusty (2:2.99.910-0ubuntu1~precise1)

and after I enabled precise-proposed repo and updated xserver-xorg-
video-intel-lts-trusty to  version 2:2.99.910-0ubuntu1.3~precise1, this
issue was fixed.

changed tag from verification-needed to verification-done

** Tags removed: verification-needed
** Tags added: verification-done

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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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