fixup! Add documentation for XFCE

nixos/doc/manual/configuration/xfce.xml

@@ -2,7 +2,7 @@
          xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:xi="http://www.w3.org/2001/XInclude"
          version="5.0"
-         xml:id="sec-x11">
+         xml:id="sec-xfce">
 
     <title>XFCE Desktop Environment</title>
 
@@ -46,4 +46,59 @@
         </programlisting>
     </para>
 
+    <simplesect>
+        <title>Thunar Volume Support</title>
+
+        <para>
+            To enable
+            <emphasis>Thunar</emphasis>
+            volume support, put
+            <programlisting>
+                services.xserver.desktopManager.xfce.enable = true;
+            </programlisting>
+            into your <emphasis>configuration.nix</emphasis>.
+        </para>
+
+    </simplesect>
+
+    <simplesect>
+        <title>Polkit Authentication Agent</title>
+
+        <para>
+            There is no authentication agent automatically installed alongside
+            XFCE. To allow mounting of local (non-removable) filesystems, you
+            will need to install one.
+
+            Installing <emphasis>polkit_gnome</emphasis>, a rebuild, logout and
+            login did the trick.
+        </para>
+
+    </simplesect>
+
+    <simplesect>
+        <title>Troubleshooting</title>
+
+        <para>
+            Even after enabling udisks2, volume management might not work.
+            Thunar and/or the desktop takes time to show up.
+
+            Thunar will spit out this kind of message on start
+            (look at journalctl --user -b).
+
+            <programlisting>
+                Thunar:2410): GVFS-RemoteVolumeMonitor-WARNING **: remote volume monitor with dbus name org.gtk.Private.UDisks2VolumeMonitor is not supported
+            </programlisting>
+
+            This is caused by some needed GNOME services not running.
+            This is all fixed by enabling "Launch GNOME services on startup" in
+            the Advanced tab of the Session and Startup settings panel.
+            Alternatively, you can run this command to do the same thing.
+            <programlisting>
+                $ xfconf-query -c xfce4-session -p /compat/LaunchGNOME -s true
+            </programlisting>
+            A log-out and re-log will be needed for this to take effect.
+        </para>
+
+    </simplesect>
+
 </chapter>