Since this issue does not affect a test machine with nouveaufb, and
plymouth disables use of the drm backend by default on nouveau, I tried
both forcing nouveau with drm and testing intel without it (by moving
drm.so aside).  On nouveau I still get a smooth transition from grub to
plymouth, with either drm or framebuffer backends.  On intel with the
framebuffer backend, plymouth thinks it's rendering but the screen is
*blank* until I switch the console from graphics mode to text mode and
back (either with a double VT switch, or by double-tapping Esc).

So I think this points to a bug in the intel kernel driver.

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https://bugs.launchpad.net/bugs/855764

Title:
  text console between grub and plymouth in oneiric, with current grub

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