Didier, have you tried enabling force_glx_sync as Travis suggested?
Maybe that gives a clue as to what functionality is bugged here?

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to nvidia-graphics-drivers in ubuntu.
https://bugs.launchpad.net/bugs/687738

Title:
  nvidia driver shows "magnet distortion"-like screen corruption and
  tearing, particularly when switching workspaces

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