I figured it out.... like explained in the previous page /sys/class/graphics/fb0/rotate controles the screen rotation (duh). Therefore the correct configuration for my libra h2o in portrait mode is :
export QT_QPA_PLATFORM=kobo:touchscreen_rotate=90:touchsc reen_invert_x=0:touchscreen_invert_y=0:logicaldpit arget=300
echo 4 > /sys/class/graphics/fb0/rotate
|