grub2 output to both console and serial

[William Thompson <wt@electro-mechanical.com>]

I am not on the list, keep me in CC.

Is it possible to output to both the vga console and the serial terminal as
with older versions of grub?  I thought I did this at one time but am unable
to do this now.  At this time, the oldest grub version I used is
1.96+20080724-16