One Grub, two systems, no solution after all.

[Rob]

Chuck Hallenbeck <chuckhallenbeck at gmail.com> wrote:
> I guess I don't know how to add anything to a kernel command line with grub,
> other than through the /etc/default/grub file and
> grub-mkconfig.  How would you do it?

You will want to directly edit
/boot/grub/grub.cfg
look for the line that starts something like
linux some other stuff/boot/vmlinuz-something-else
add
loglevel=1
to the end of the line.