Your laptop screen probably defaults to 800x600 or 1024x***, and your SUSE desktop is probably set to a smaller size, try setting it to default, which will be the same as Mandrakes screen size, if that makes sense.
ie. Your Mandrake res is 1024x768, but your SUSE is set to 600x480, so the LCD only displays 1/2 the size.
Im still learning though, so dont quote me.
I dont know what this has to do with LFS though..