I really tried:
xbmc -fs
And using the script way:
xbmc
sleep 10
wmctrl -x -r XBMC Media Center.XBMC Media Center -b toggle,fullscreen
From this script.
And yes, I know the key "|\" exists to switch between windowed and fullscreen. But I want to force to always in fullscreen mode.
None this works. Any sugestion?