I don't want to tell you something you already know but this:

I tried: knoppix xmodule=vesa|fbdev
knoppix screen=1024x768
knoppix 2
knoppix init 3
knoppix noscsi
knoppix mem=512M
failsafe
fb1024x768
knoppix-txt
knoppix vga=normal
isn't the right way to do it. It should be like this e.g.:

knoppix lang=us screen=1024x768 2 vga=normal mem=512M

and so on........