i also have an intelfb, and it does not work at all.
Did u try some other values of vga? Try to use some lower resolutions. Maybe yours graphic card don't support some high resolutions in fb, or yours kernel doesn't support fb? I'm using 2.6.18-4-686 from repo.
-- Pozdrawiam, Damian Ryszka rychu(at)sileman(dot)net(dot)pl