NV_PRAMDAC_FP_HSYNC_START
NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_HSYNC_START, fp_hsync_start);
fp_hsync_start = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_HSYNC_START);
NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_HSYNC_START, 1047);