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[Launchpad Bug Tracker <1373776@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package xserver-xorg-video-intel -
2:2.99.910-0ubuntu1.2

---------------
xserver-xorg-video-intel (2:2.99.910-0ubuntu1.2) trusty-proposed; urgency=medium

  [ Maarten Lankhorst ]
  * Fix black screen with SNA. (LP: #1365695)

  [ Timo Aaltonen ]
  * fix-no-backlight.diff: Don't let backlight switch off when cycling
    through display modes. (LP: #1373776)
 -- Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxx>   Mon, 20 Oct 2014 09:54:57 +0200

** Changed in: xserver-xorg-video-intel (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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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:
  Fix Released

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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