nv_crtc2_dpms
head1_dpms = (crtc_dpms) nv_crtc2_dpms;
head2_dpms = (crtc_dpms) nv_crtc2_dpms;
nv_crtc2_dpms(false, false, false, true);
nv_crtc2_dpms(false, false, false, true);
status_t nv_crtc2_dpms(bool, bool, bool, bool);