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We are working on supporting flickerfree boot in RHEL-8, see:
https://issues.redhat.com/browse/DESKTOP-342

The grub, kernel (bug 1878805) and plymouth (bug 1688935) side of this is in place now, so this is basically working if users opt-in to enabling the grub-hidden-menu featuere by calling:

"sudo grub2-editenv - set menu_auto_hide=1"

One thing which is not yet working is shutting-down or rebooting from directly within gdm (or from a user-session which has lasted less then 2 minutes). In this case the grub boot_success flag will not get set, so the grub menu will show on the next boot leading to an ugly / non-smooth boot experience.

In Fedora we have a small downstream (*) patch for this:
https://src.fedoraproject.org/rpms/gnome-session/blob/master/f/0001-Fedora-Set-grub-boot-flags-on-shutdown-reboot.patch

It would be great if this patch can be added to the RHEL-8 gnome-session packages to to complete flicker-free boot support for RHEL-8.



*) Coming up with an upstream solution is still being worked on

fine with me

Verified on gnome-session-3.28.1-13.el8, but selinux-policy is preventing the functionality, see: https://bugzilla.redhat.com/show_bug.cgi?id=1994096

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: GNOME security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4381