You can pass options to vesafb using "video=vesafb:option" on the kernel command line. Multiple options should be separated by comma, like this: "video=vesafb:ypan,1024x768-32@85"
Before you do this, you need to make sure vesa support is compiled into the kernel, not as a module. You can find more options in:
"/usr/src/linux/Documentation/fb/vesafb.txt"
This is my /boot/grub/grub.conf on my laptop (running Gentoo) as an example:
Code:
default 0
timeout 15
splashimage=(hd0,0)/grub/splash.xpm.gz
title=Gentoo Linux 2.6.12-r10
root (hd0,0)
kernel /bzImage.r10 quiet root=/dev/hda3 video=vesafb:ywrap,mtrr,1280x1024-32@85 splash=verbose,theme:livecd-2005.1 CONSOLE=/dev/tty1
boot