PV_CONTROL_EN
CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) & ~PV_CONTROL_EN);
if (!(CRTC_READ(PV_CONTROL) & PV_CONTROL_EN))
CRTC_WRITE(PV_CONTROL, CRTC_READ(PV_CONTROL) | PV_CONTROL_EN);