@zing Hi! thanks for all your answers.
I don't know what is happening.
xrandr -s 1920x1080 for example doesnt work :
Can't open display
I know that batocera is another thing, but in batocera, in menu I can choose my display (for example auto, vga, etc), and If i select vga it works fine .... but i like more recalbox over batocera.