xm console not working (blank)

on some xen domUs I recently figured that the xm console didn't come
up. so investigating the issue I found out that you gotta set the
tty in the machine's config like this:

extra       = 'xencons=tty1'

but still I get a blank screen instead of the login. solution is simple,
for systems still having an inittab (eg. debian) look for the following
line:

nano /etc/inittab

1:2345:respawn:/sbin/getty 38400 tty1

for systems which utilize upstart already (ubuntu) look for another file:

nano /etc/event.d/tty1

start on stopped rc2
start on stopped rc3
start on stopped rc4
start on stopped rc5

stop on runlevel 0
stop on runlevel 1
stop on runlevel 6

respawn
exec /sbin/getty 38400 tty1

makes the xm console work on all my machines again.