Comment 5 for bug 697824

Yes, you can send output to multiple consoles, but only one can get input, and I think the last one wins; also, some messages only make it to one console (I think /dev/console is the problem, it is the last specified console= or current active VT).

serialtty= is handled by some initramfs foo which will create upstart jobs spawning a getty. If you spawn a respawn getty on a non-existing tty, you get regular syslog output that it's not available. We could re-engineer this bit to use udev events to setup gettys on well known consoles if the devices exists?