Public bug reported:

I'm running Ubuntu 13.10 on a MacBookAir5,2.  The machine has an Intel
HD Graphics 4000 processor.

Every few minutes, a bunch of garbage blank lines flickers onto the
screen for a fraction of a second and then vanishes.  I also saw this
running 13.04 on the same machine, but never before that.  It's
impossible for me to capture a screenshot since it's completely
unpredictable when this will happen.  But it's pretty distracting.

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1177358

Title:
  black line garbage flickers onto screen every few minutes

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