vga=794 means that you are trying to get into 1280x1024 resolution. Is that what you want? I know most laptops do not have screens of that resolution, but instead either 1024x768 or 1400x1050. I suggest changing vga=794 to vga=791, which will give you 1024x768.
With FC1 that's fine and looks work, i like the resolution.....
I think, because framebuffer mode used, and conflict with X-Window framebuffer.....
confuse maybe