Unfortunately the backtrace and valgrind log show just what you said, this is a crash in the nvidia driver. There is nothing we can do about that.
** Package changed: compiz (Ubuntu) => nvidia-graphics-drivers (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/670592 Title: compiz crashes when screensaver activates -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs