system console redirection - all but boot messages redirected ttyS0?

Chris Adams cmadams at
Thu Nov 24 05:27:07 UTC 2011

Once upon a time, Morgan Read <mstuff at> said:
> Thanks for getting back - I followed your instructions.  It seemed I
> needed to swap console=ttyS0 and console=tty0 BUT opposite from what you
> suggested.  That is, console=ttyS0 was last and by swapping it with
> console=tty0 and making console=ttyS0 listed first I had rc script
> (userspace) messages reported to ttyS0...  Strange?
> Stranger still, when I did the above, I stopped getting a login prompt
> on ttyS0.  So, swapping as I said above (opposite to your suggestion)
> gave me rc script messages to ttyS0 and no login...
> Do you have any ideas how to get the login prompt back?

It is a bug in plymouth (which provides the graphical boot animations).
You can add "rd_NO_PLYMOUTH" to your boot line (as long as you don't
have encrypted filesystems) and the serial console should work as
expected (with console=ttyS0 listed after console=tty0).

I think it is fixed in newer plymouth, but I'm not sure.  I see the bug
on RHEL 6 systems, and the fix has not been released there yet.
Chris Adams <cmadams at>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

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