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[Launchpad Bug Tracker <1072206@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package compiz -
1:0.9.11.3+14.04.20150313-0ubuntu1

---------------
compiz (1:0.9.11.3+14.04.20150313-0ubuntu1) trusty; urgency=medium

  [ Andrea Azzarone ]
  * removed texture caching from animations (LP: #729979, #1072206)

  [ Chris Townsend ]
  * Add a blacklist of Nvidia integrated GPU's affected by the Nvidia
    X11 Sync patch. (LP: #1424013)
 -- CI Train Bot <ci-train-bot@xxxxxxxxxxxxx>   Fri, 13 Mar 2015 17:25:30 +0000

** Changed in: compiz (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1072206

Title:
  [nvidia] Window content is black or transparent

Status in Compiz:
  Fix Committed
Status in Compiz 0.9.11 series:
  In Progress
Status in NVIDIA Drivers Ubuntu:
  Invalid
Status in Unity:
  Invalid
Status in compiz package in Ubuntu:
  Fix Released
Status in unity package in Ubuntu:
  Invalid
Status in compiz source package in Trusty:
  Fix Released

Bug description:
  [ Impact ]

  With nVidia hardware from time to time window content is rendered
  black or transparent.  The problem manifests more frequently as
  session uptime increases.

  Apparently the problem was caused by textures being cached and not
  freed, resulting in memory exhaustion conditions.  It turns out the
  texture caching is unnecessary anyway.

  [ Test Case ]

  Verification requires an nVidia GPU with proprietary drivers.  The
  problem can not be reproduced at will, only after some time (depending
  on resident GPU memory and usage) and even then only randomly and
  unreliably.

  [ Regression Potential ]

  It is unlikely this change has the potential to introduce new
  regressions.

  [ Other Info ]

  Fix was cherry-picked from the Ubuntu "Vivid Vervet" dev relase where
  it has been in use for some weeks without problem.

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