SC_POWERSAVE
sc->sc_flags &= ~SC_POWERSAVE;
sc->sc_flags |= SC_POWERSAVE;
sc->sc_flags & SC_POWERSAVE) {
sc->sc_flags &= ~SC_POWERSAVE;
if (sc->sc_flags & SC_POWERSAVE) {
sc->sc_flags &= ~SC_POWERSAVE;