function updateBrightness(rootItem, source) {
    if (rootItem.updateScreenBrightnessJob)
        return;

    if (!source.data["PowerDevil"]) {
        return;
    }

    // we don't want passive brightness change send setBrightness call
    rootItem.disableBrightnessUpdate = true;

    if (typeof source.data["PowerDevil"]["Screen Brightness"] === 'number') {
        rootItem.screenBrightness = source.data["PowerDevil"]["Screen Brightness"];
    }
    rootItem.disableBrightnessUpdate = false;
}