Ok, I think I got what the problem is. And, unfortunately, I think the solution 
is out of reach, at least for me.
It seems we x86_64 are simply short of a usable working vesa module! That's 
right, because:

vesafb doesn't work with newer cards. The fact that with x86 it works, it's 
because it is, in reality, vesafb-tng, the newer release, which of course isn't 
availabe on x86_64.
nvidiafb or ati equivalent doesn't work because thay won't work with the 
proprietary driver.

There is an alternative: uvesafb
(http://dev.gentoo.org/~spock/projects/uvesafb/), which is the evolution
of vesafb-tng. It works on every architecture and it's completely
userland. It needs a kernel patch, though, and offer also some new
features, like VESA 3.0 compatibility.

If Ubuntu's folks can implement uvesafb, we should be set! ;)

-- 
[EM64T]When booting, screen stays black.
https://bugs.launchpad.net/bugs/147623
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