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 Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/687738 Title: nvidia driver shows "magnet distortion"-like screen corruption and tearing, particularly when switching workspaces -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs