The current implementation of fullscreen in the X11 backend has multiple issues. For instance: https://bugzilla.redhat.com/show_bug.cgi?id=482302 When exiting from full screen mode ,spice window title bar is hidden by linux panel. In general its just not a good idea to try to handle WM/toplevel-window interaction in raw Xlib. We can use xlib to render in a window, but toplevel windows should be managed by a toolkit like e.g. Gtk+.
Also: https://bugzilla.redhat.com/show_bug.cgi?id=557487 In KDE, when there are opened windows and spice is just opened, its screen is sometimes hidden beneath other windows. Spice should be opened above all the windows.
And: https://bugzilla.redhat.com/show_bug.cgi?id=557487 In KDE - after toggling to full screen (shift+F11), toggling back wouldn't work without pressing the window first (i.e., turn it to be focused).
Also: https://bugzilla.redhat.com/show_bug.cgi?id=557489 KDE dual monitor - full screen windows are not spread among monitors
spicec is deprecated. we highly recommended virt-viewer http://virt-manager.org/download/ http://www.spice-space.org/download.html If you hit *any* of the bugs here listed, please open a new bug.
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