Is this still true?
With Linux 5.10 (Debian bullseye), I can have:
$ fgrep console /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="console=tty0 console=ttyS0,115200 TZ=:UTC"
GRUB_TERMINAL='console serial'
$ cat /sys/class/tty/console/active
tty0 ttyS0
And I can see the kernel messages on the video console and both kernel
and initramfs messages on the serial console and can interact with the
cryptroot unlock via the serial console, and later getty is started on
both.
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https://bugs.launchpad.net/bugs/1807140
Title:
The last console= argument is not used by the kernel
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