This doesn't fix it for me. And neither does stopping thinkpad-keys. I'm attaching gnome-screensaver's debug log. The screensaver correctly activates with gnome-screensaver-command --activate and with the lock screen button.
** Attachment added: "gnome-screensaver debug log" http://librarian.launchpad.net/2488440/gnome-screensaver.log -- screensaver doesn't activate https://launchpad.net/bugs/37555 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
