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[dack <600178@xxxxxxxxxxxxxxxxxx>]

I have tested both nvidia driver and nouveau under unity, classic, and
classic (no effects).  Changing driver makes no difference.  Single or
dual display makes no difference.  Tearing is less with classic (no
effects), but still present.  The only thing that solves it for me is
disabling the composite extension in xorg.conf.

Seems to me like we have either bugs in both nouveau and nvidia or a bug
in xorg somewhere (composite extension? GL libs?).

I've filed a bug report with xorg/nouveau as well:
https://bugs.freedesktop.org/show_bug.cgi?id=37681

** Bug watch added: freedesktop.org Bugzilla #37681
   http://bugs.freedesktop.org/show_bug.cgi?id=37681

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which is subscribed to nvidia-graphics-drivers in Ubuntu.
https://bugs.launchpad.net/bugs/600178

Title:
  Screen tearing when dragging window, in videos and other large screen
  redraws (on nVidia GPU)