- does hitting 'esc' once instead of Alt+F6/Alt+F7 fix the issue?
Yes - I get a text-only password prompt

 - does hiting 'esc' *twice* fix the issue?
Yes - I see the graphical password prompt (= GPP)

 - does hitting Alt+F7 *without* hitting Alt+F6 fix the issue?
No - screen switches to powersave (no backlight) but accepts password typed 
blindly

 - what do you see if you boot without the 'quiet' option (but still with the 
'splash' option)?
Depends on how, I remove the quiet:
a) If I trigger the grub boot menu, I always correctly get the GPP invariant of 
quiet or not quiet
b) Removing quiet from /etc/default/grub and running update-grub still leaves 
me with the screen in powersave

This machine is a notebook, originally installed with either oneric or
natty alternate CD and updated up to quantal without reformating the
hard-disk since.

** Attachment added: "plymouth-debug.log"
   
https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/869119/+attachment/3511852/+files/plymouth-debug.log

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https://bugs.launchpad.net/bugs/869119

Title:
  screen goes blank before showing password prompt (inteldrmfb,
  cryptsetup)

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