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[Launchpad Bug Tracker <1414101@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1414101

Title:
  backlight flickers with Intel HD Graphics 4400 and 3.13.0-44

Status in linux package in Ubuntu:
  Expired

Bug description:
  Since upgrading my Trusty kernel to 3.13.0-44.73, the backlight on my
  Ultrabook laptop flickers frequently.  It seems to flicker whenever an
  X application refreshes part of its window.  The backlight flicker is
  most noticeable with Chrome browser and mplayer video player.
  Sometimes it will flicker a few times, sometimes continue to flicker
  quickly.  Occasionally the backlight will stay off for a while, and
  then I can see the windows very faintly if I have good room lighting,
  so it's definitely a backlight problem.

  My display hardware is Intel HD Graphics 4400 (i965 driver)

  I backed off to the previous kernel, 3.13.0-43.72, and the flickering
  problem stopped.  Now backlight stays on consistently, as it should.

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