Detailed look at how Plymouth works.
"Back in July we shared Red Hat's intentions to replace RHGB with
Plymouth, a new graphical boot process that is able to benefit from the
latest Linux graphics capabilities. Red Hat engineers had primarily
designed Plymouth around a forthcoming feature we've talked about quite
a bit known as kernel mode-setting, which provides end-users with a
cleaner and flicker-free boot experience. In September in The State of
Kernel Mode-Setting we then shared more information on Plymouth along
with a brief video. Most recently we published another video of Plymouth
that shows the tighter integration between the boot process and starting
the GNOME Display Manager. Today though we are looking at Plymouth and
its different plug-ins along with providing a few more videos."