TP_NVRAM_ADDR_BRIGHTNESS
d = nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS);
lnvram = (nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS)
b_nvram = nvram_read_byte(TP_NVRAM_ADDR_BRIGHTNESS);
nvram_write_byte(b_nvram, TP_NVRAM_ADDR_BRIGHTNESS);