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https://gitlab.gnome.org/GNOME/gdm/issues/433

A confusing bug affects Gnome versions until 3.32. If the user of a single-user system enables the "org.gnome.desktop.input-sources show-all-sources" option and selects one of the "extra" keyboard layouts, the setting is applied globally to everywhere else but not GDM. This is confusing and may prevent user from logging in.

If Gnome isn't going to be rebased soon, you might want to consider backporting this fix to RHEL 7/8. It is not very complicated, just a single dconf setting:

https://gitlab.gnome.org/GNOME/gdm/commit/3b9797d759b42b85be309a1b3cbbf52cb3e47de5

(fix is already mentioned, moving to POST)

Verified on a single user VM with RHEL7.9 Beta 1.1.

On gdm-3.28.2-22.el7:
$ DCONF_PROFILE=gdm gsettings get org.gnome.desktop.input-sources show-all-sources
false

On gdm-3.28.2-23.el7:
$ DCONF_PROFILE=gdm gsettings get org.gnome.desktop.input-sources show-all-sources
true

No other changes made besides the updated GDM rpm.

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 (GNOME 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/RHBA-2020:3987