Seems (full) fresh installs of RH61 forget to make an alias
in /etc/conf.modules aliasing parport_lowlevel to parport_pc
(or whatnot). Result: No /dev/lpx ports available for
printing. Message (see summary) in /var/log/messages
pointing to the obvious reason for this problem though.
Simply add this to /etc/conf.modules to fix the problem :
alias parport_lowlevel parport_pc

Problem verified with other RH61 user who concurs on the
phenomena.