voyagerfb_set_backlight
voyagerfb_set_backlight(sc, level);
voyagerfb_set_backlight(sc, sc->sc_bl_level + 8);
voyagerfb_set_backlight(sc, sc->sc_bl_level - 8);
static void voyagerfb_set_backlight(struct voyagerfb_softc *, int);
voyagerfb_set_backlight(sc, param->curval);