modify debian console resolution

debian console resolution change


title        Debian GNU/Linux, kernel 2.6.26-2-amd64
root        (hd0,5)
kernel        /boot/vmlinuz-2.6.26-2-amd64 root=/dev/sda6 ro vga=0x303
initrd        /boot/initrd.img-2.6.26-2-amd64

http://en.wikipedia.org/wiki/VESA_BIOS_Extensions