Eu acredito que você está procurando por fbcon , você precisaria dessa opção:
3. fbcon=map:<0123>
This is an interesting option. It tells which driver gets mapped to
which console. The value '0123' is a sequence that gets repeated until
the total length is 64 which is the number of consoles available. In
the above example, it is expanded to 012301230123... and the mapping
will be:
tty | 1 2 3 4 5 6 7 8 9 ... fb | 0 1 2 3 0 1 2 3 0 ...
('cat /proc/fb' should tell you what the fb numbers are)