Starting gnome services on startup (4.12)

[Jarmo Hurri]

Greetings.

Just finished installing Fedora 22 on a new computer, and the OS came
with Xfce 4.12. I am having a problem getting gnome services running on
startup.

The problem appears when I try to run gnome-screensaver:

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[jarmo at localhost ~]$ gnome-screensaver

** (gnome-screensaver:8631): WARNING **: Couldn't get presence status:
The name org.gnome.SessionManager was not provided by any .service
files
--------------------------------------------------------------------------

>From previous experience I think (?) this implies that gnome services
are not running. However, in the Advanced tab of "Session and startup" I
have set "Launch GNOME services on startup", and I also have
gnome-session installed:

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[jarmo at localhost ~]$ dnf list installed 'gnome*'
Installed Packages
gnome-abrt.x86_64                          1.2.0-2.fc22                  @System
gnome-desktop3.x86_64                      3.16.2-1.fc22                 @System
gnome-icon-theme.noarch                    3.12.0-2.fc21                 @System
gnome-keyring.x86_64                       3.16.0-1.fc22                 @System
gnome-keyring-pam.x86_64                   3.16.0-1.fc22                 @System
gnome-online-accounts.x86_64               3.16.3-1.fc22                 @System
gnome-python2.x86_64                       2.28.1-15.fc22                @System
gnome-screensaver.x86_64                   3.6.1-9.fc22                  @System
gnome-session.x86_64                       3.16.0-1.fc22                 @System
gnome-themes.noarch                        2.32.0-12.fc21                @System
gnome-themes-standard.x86_64               3.16.2-1.fc22                 @System
gnome-vfs2.x86_64                          2.24.4-18.fc22                @System
gnome-vfs2-common.noarch                   2.24.4-18.fc22                @System
--------------------------------------------------------------------------

Could someone tell me what I am doing wrong.

Jarmo