SetDPMS
status_t SetDPMS(uint32 state);
status_t SetDPMS(uint32 dpmsState);
bs.SetDPMS(B_DPMS_ON);
bs.SetDPMS(B_DPMS_STAND_BY);
bs.SetDPMS(B_DPMS_SUSPEND);
bs.SetDPMS(B_DPMS_OFF);
screen.SetDPMS(B_DPMS_ON);
screen.SetDPMS(mode);
return fScreen->SetDPMS(dpmsState);
return BScreen().SetDPMS(state);
return BScreen().SetDPMS(state);