New framebuffer size settings in Grub2 (vga=xxx is obsolete)

Set desired console resolution in /etc/default/grub

GRUB_GFXMODE=1200x1024x16

Add the following line in /etc/grub.d/00_header

set gfxpayload=keep

Directly after this one: set gfxmode=${GRUB_GFXMODE}



Now update grub:

update-grub


That's it!