Tip regarding nvidia optimus (dual graphics nvidia/intel) and efiboot

[coypu%sdf.org@localhost]

(thanks ryoon for a hint)

To boot it with graphical acceleration on uefiboot, I need to disable
genfb specifically.
That is, drop to boot prompt, type
> userconf disable genfb
> boot

you can add this to /boot.cfg too.

Otherwise it tries genfb for the nvidia card, and i915 for intel, which
doesn't work well because they are physically dependent cards, and I get
a blank screen after mode switch.

Another option is to disable i915drmkms, then I am left with the nvidia
genfb.