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I added console=ttyS0,57600n8 to my kernel command line. I get the normal boot messages until this

[ 5.123106] EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
Begin: Running /scripts/local-bottom ... done.
Begin: Running /scripts/init-bottom ... done.

Then no more output. I am trying to debug a kernel panic using kdump, but can't quite get kdump to work. I want the serial console to get kdump working.

[edit] I worked around the problem using a virtual machine.

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You should try removing the "quiet" and hte other option from the grub config too. I can't remember it's name now, sorry. If you post a picture about the grub config (at boot), I'll help you pinpoint the other option too. – Shiki Aug 17 '12 at 17:32
do you want me to hit e and take a pic of the kernel arguments? – Brian O'Dell Aug 17 '12 at 18:22
Yes............. – Shiki Aug 17 '12 at 21:57
up vote 1 down vote accepted

You will almost certainly also need to update your inittab, or upstart configuration in addition to the kernel options.

init - /etc/inittab

T0:23:respawn:/sbin/getty -L ttyS0 57600 vt102

Upstart - /etc/init/ttyS0.conf

# ttyS0 - getty
# This service maintains a getty on ttyS0 from the point the system is
# started until it is shut down again.

start on stopped rc or RUNLEVEL=[2345]
stop on runlevel [!2345]

exec /sbin/getty -L ttyS0 57600 vt102
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