This is happening because the VBE BIOS advertises a 1440x900x32 mode
(and even advertises 1440x900 as the best mode, though I don't think
EDID is specific about the preferred depth) but fails to program it
correctly.  I don't know what the best solution to this is as yet.

** Changed in: grub2 (Ubuntu)
   Importance: Undecided => High

** Changed in: grub2 (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/701111

Title:
  corrupted and flashing grub screen on T400

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