Edit 20170920: You can disable the framebuffer by adding
nomodeset vga=0 but that disables for example your Intel graphics card.

/etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="fb=false nofb video=800x600 vga=0"
GRUB_TERMINAL=console
GRUB_GFXMODE=800x600
GRUB_GFXPAYLOAD_LINUX=800x600

$ sudo update-grub

/home/username/.bash_profile

if /usr/bin/tty | /bin/fgrep tty >/dev/null 2>/dev/null
then
        /bin/fbset -g 800 600 800 600 32
fi
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