Disabling "Unredirect Fullscreen Windows" in "General Options --> Genaral" sorts this out for me.
-- Compiz causes OpenGL fullscreen games to eventually go windowed. https://bugs.launchpad.net/bugs/157759 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs