root {
    backlightConfig {
        pwmBacklightConfig {
            match_attr = "pwm_bl_dev";
            pwmDevNum = 1;
            pwmMaxPeroid = 100000;
            backlightDevName = "hdf_pwm";
            minBrightness = 0;
            defBrightness = 127;
            maxBrightness = 255;
        }
    }
}