NV_PRAMDAC_FP_HSYNC_END
NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_HSYNC_END, fp_hsync_end);
fp_hsync_end = NVReadRAMDAC(dev, head, NV_PRAMDAC_FP_HSYNC_END);
NVWriteRAMDAC(dev, head, NV_PRAMDAC_FP_HSYNC_END, 1183);