So this is what I've done precisely. Got so eager (and dead tired btw) that I followed the instructions like a total moron without reading the details. Nearly bricked my computer, Good I could log into second console and undo what I screwed up.
No offence to the developer, just a warning: always read the readme files before you do anything. Think of yourself as a Linux guru? Think again 😀
This is not for NVidia cards. I will have to test it anyway on a second machine that has a Intel I945 built in graphics chip.