Comment 17 for bug 1850886

I debugged it, found that by default it will use gdm-wayland-session in greeter UI.

/usr/lib/gdm3/gdm-wayland-session gnome-session --autostart /usr/share/gdm/greeter/autostart

After login the system, it will use the gdm-x-session, so this might be the root cause.

When I try to disable Wayland in gdm3, this issue is fixed, because it will use gdm-x-session all the time.

cat /etc/gdm3/daemon.conf
# GDM configuration storage
#
# See /usr/share/gdm/gdm.schemas for a list of available options.

[daemon]
# Uncomment the line below to force the login screen to use Xorg
WaylandEnable=false