Le temps de faire rallumer la machine par quelqu'un (je ne suis pas sur le lieu de la machine), et voici le résultat des commandes:
dnf list *vnc*
Last metadata expiration check: 3:02:50 ago on Fri Jun 10 10:08:34 2016.
Installed Packages
gtk-vnc2.i686 0.5.4-2.fc23 @fedora
gvnc.i686 0.5.4-2.fc23 @fedora
tigervnc-license.noarch 1.6.0-1.fc23 @updates
tigervnc-server.i686 1.6.0-1.fc23 @updates
tigervnc-server-minimal.i686 1.6.0-1.fc23 @updates
Available Packages
gtk-vnc.i686 0.5.4-2.fc23 fedora
gtk-vnc-devel.i686 0.5.4-2.fc23 fedora
gtk-vnc-python.i686 0.5.4-2.fc23 fedora
gtk-vnc2-devel.i686 0.5.4-2.fc23 fedora
gvnc-devel.i686 0.5.4-2.fc23 fedora
gvnc-tools.i686 0.5.4-2.fc23 fedora
gvncpulse.i686 0.5.4-2.fc23 fedora
gvncpulse-devel.i686 0.5.4-2.fc23 fedora
libguac-client-vnc.i686 0.9.7-1.fc23 fedora
libvncserver.i686 0.9.10-3.fc23 updates
libvncserver-devel.i686 0.9.10-3.fc23 updates
mingw32-gtk-vnc.noarch 0.5.4-4.fc23 fedora
mingw32-gtk-vnc2.noarch 0.5.4-4.fc23 fedora
mingw32-gvnc.noarch 0.5.4-4.fc23 fedora
mingw32-gvnc-tools.noarch 0.5.4-4.fc23 fedora
mingw64-gtk-vnc.noarch 0.5.4-4.fc23 fedora
mingw64-gtk-vnc2.noarch 0.5.4-4.fc23 fedora
mingw64-gvnc.noarch 0.5.4-4.fc23 fedora
mingw64-gvnc-tools.noarch 0.5.4-4.fc23 fedora
netbeans-svnclientadapter.noarch 7.3.1-0.4.1.8.22.fc23 fedora
netbeans-svnclientadapter-javadoc.noarch 7.3.1-0.4.1.8.22.fc23 fedora
novnc.noarch 0.5.1-3.fc23 fedora
openstack-nova-novncproxy.noarch 2015.1.3-1.fc23 updates
pyvnc2swf.noarch 0.9.5-17.fc23 fedora
remmina-plugins-vnc.i686 1.2.0-0.8.git.b3237e8.fc23 fedora
svncpp.i686 0.12.1-7.fc23 fedora
svncpp-devel.i686 0.12.1-7.fc23 fedora
tigervnc.i686 1.6.0-1.fc23 updates
tigervnc-icons.noarch 1.6.0-1.fc23 updates
tigervnc-server-applet.noarch 1.6.0-1.fc23 updates
tigervnc-server-module.i686 1.6.0-1.fc23 updates
vnc-ltsp-config.noarch 4.0-14.fc23 fedora
vnc-reflector.i686 1.2.4-19.fc23 fedora
x11vnc.i686 0.9.14-1.fc23 updates
x11vnc-javaviewers.noarch 0.9.14-1.fc23 updates
dnf list xfce*
Last metadata expiration check: 2:56:25 ago on Fri Jun 10 10:08:34 2016.
Installed Packages
xfce4-about.i686 4.12.1-3.fc23 @fedora
xfce4-appfinder.i686 4.12.0-4.fc23 @fedora
xfce4-datetime-plugin.i686 0.6.2-6.fc23 @fedora
xfce4-notifyd.i686 0.2.4-8.fc23 @fedora
xfce4-panel.i686 4.12.0-4.fc23 @fedora
xfce4-places-plugin.i686 1.7.0-3.fc23 @fedora
xfce4-power-manager.i686 1.6.0-4.fc23 @updates
xfce4-pulseaudio-plugin.i686 0.2.4-1.fc23 @updates
xfce4-screenshooter.i686 1.8.2-5.fc23 @fedora
xfce4-screenshooter-plugin.i686 1.8.2-5.fc23 @fedora
xfce4-session.i686 4.12.1-6.fc23 @fedora
xfce4-session-engines.i686 4.12.1-6.fc23 @fedora
xfce4-settings.i686 4.12.0-6.fc23 @fedora
xfce4-terminal.i686 0.6.3-8.fc23 @fedora
Available Packages
xfce-bluetooth.i686 0-0.4.20150130git.fc23 fedora
xfce-polkit.i686 0.2-4.fc23 updates
xfce-theme-manager.i686 0.3.5-5.fc23 fedora
xfce4-battery-plugin.i686 1.0.5-10.fc23 fedora
xfce4-calculator-plugin.i686 0.5.1-2.fc23 updates
xfce4-cellmodem-plugin.i686 0.0.5-17.fc23 fedora
xfce4-clipman-plugin.i686 1.2.6-7.fc23 fedora
xfce4-cpufreq-plugin.i686 1.1.2-1.fc23 fedora
xfce4-cpugraph-plugin.i686 1.0.5-8.fc23 fedora
xfce4-dev-tools.i686 4.12.0-2.fc23 fedora
xfce4-dict.i686 0.7.1-2.fc23 fedora
xfce4-dict-plugin.i686 0.7.1-2.fc23 fedora
xfce4-diskperf-plugin.i686 2.5.5-2.fc23 fedora
xfce4-embed-plugin.i686 1.6.0-1.fc23 fedora
xfce4-equake-plugin.i686 1.3.8-1.fc23 updates
xfce4-eyes-plugin.i686 4.4.4-3.fc23 fedora
xfce4-fsguard-plugin.i686 1.0.2-2.fc23 fedora
xfce4-genmon-plugin.i686 3.4.0-8.fc23 fedora
xfce4-hamster-plugin.i686 1.6.1-2.fc23 fedora
xfce4-hardware-monitor-plugin.i686 1.4.7-3.fc23 updates
xfce4-kbdleds-plugin.i686 0.0.6-8.fc23 fedora
xfce4-mailwatch-plugin.i686 1.2.0-7.fc23 fedora
xfce4-mixer.i686 4.10.0-9.fc23 fedora
xfce4-mount-plugin.i686 0.6.7-5.fc23 fedora
xfce4-mpc-plugin.i686 0.4.5-2.fc23 fedora
xfce4-netload-plugin.i686 1.2.4-3.fc23 fedora
xfce4-notes-plugin.i686 1.8.1-1.fc23 fedora
xfce4-panel-devel.i686 4.12.0-4.fc23 fedora
xfce4-sensors-plugin.i686 1.2.5-3.fc23 fedora
xfce4-sensors-plugin-devel.i686 1.2.5-3.fc23 fedora
xfce4-session-devel.i686 4.12.1-6.fc23 fedora
xfce4-smartbookmark-plugin.i686 0.4.6-3.fc23 fedora
xfce4-systemload-plugin.i686 1.1.2-3.fc23 fedora
xfce4-taskmanager.i686 1.1.0-4.fc23 fedora
xfce4-time-out-plugin.i686 1.0.1-9.fc23 fedora
xfce4-timer-plugin.i686 1.6.0-2.fc23 fedora
xfce4-vala.noarch 4.10.3-7.fc23 fedora
xfce4-verve-plugin.i686 1.0.1-4.fc23 fedora
xfce4-volumed.i686 0.1.13-9.fc23 fedora
xfce4-wavelan-plugin.i686 0.5.12-2.fc23 fedora
xfce4-weather-plugin.i686 0.8.7-1.fc23 updates
xfce4-whiskermenu-plugin.i686 1.5.1-1.fc23 fedora
xfce4-xkb-plugin.i686 0.7.1-3.fc23 fedora
J'ai regardé le sujet que tu indiques, et j'ai fait les modif indiquées, mais pas mieux.
J'ai toujours un écran noir
