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From: "Rob" <captinlogic@gmail.com>
To: "Speakup is a screen review system for Linux." <speakup@linux-speakup.org>
Subject: Re: One Grub, two systems, no solution after all.
Date: Mon, 26 Sep 2016 13:37:37 -0500
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Chuck Hallenbeck <chuckhallenbeck@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=3D1
to the end of the line.