I've read that already. However, as I already said, there is *no* difference, 
if vt.handoff is enabled or not.
I've disabled vt.handoff now, as per above, and booting is very smooth:

- Grub boot menu appears (with customised background image)
- after making a selection (or waiting until the boot countdown is up), 
background stays for 2-3 seconds
- Plymouth boot screen appears seamlessly
- once booting is completed, the LightDM login screen appears seamlessly

All very smooth. At no point, there's a black screen for a few seconds, or 
screen flickering.
Thus, as I see it, vt.handoff not only does *nothing*, but is even harmful, in 
that it prevents the boot screen from appearing, and you end up with a black 
screen during boot.

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https://bugs.launchpad.net/bugs/1057532

Title:
  Monitor goes black ("no signal") after Grub, comes back to life when X
  starts

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