So, I finally found which compiz plugin was doing that… It's the unity one. I have no issue in the classic session with exactly the same settings apart from unity loaded.
** Package changed: compiz (Ubuntu) => unity (Ubuntu) ** Also affects: unity Importance: Undecided Status: New ** Changed in: unity Status: New => Triaged ** Changed in: unity Importance: Undecided => High ** Summary changed: - nvidia driver shows "magnet distortion"-like screen corruption and tearing when switching workspaces + nvidia driver shows "magnet distortion"-like screen corruption and tearing, particularly when switching workspaces ** Changed in: unity Assignee: (unassigned) => Sam "SmSpillaz" Spilsbury (smspillaz) -- 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp