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[Bug 1414101] Re: backlight flickers with Intel HD Graphics 4400 and 3.13.0-44


Stephen Gildea, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1414101

When reporting bugs in the future please use apport by using 'ubuntu-
bug' and the name of the package affected. You can learn more about this
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** Package changed: linux-lts-trusty (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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

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  backlight flickers with Intel HD Graphics 4400 and 3.13.0-44

Status in linux package in Ubuntu:

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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