I get the "you passed an undefined mode number" error. I've tried fb800x600, knoppix nosmp vga=normal screen=800x600 xvrefresh=60 and I've tried knoppix-txt, and while those get past the error, after "uncompressing kernel..." my screen goes blank, and the cdrom keeps being hit.

My machine is a Micron Millennia Transport laptop.

edit: video is a Cirrus Logic GD7548