From e7f45a0d315442dcf789997d6e28de72f082e28a Mon Sep 17 00:00:00 2001
From: Ryan Ronnander <61520+ryan-ronnander@users.noreply.github.com>
Date: Mon, 7 Sep 2026 21:09:02 -0400
Subject: [PATCH] [mqtt] Restore brightness flag in light discovery (#18950)

---
 esphome/components/mqtt/mqtt_light.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/esphome/components/mqtt/mqtt_light.cpp b/esphome/components/mqtt/mqtt_light.cpp
index aa47bdf996..a8b52a3839 100644
--- a/esphome/components/mqtt/mqtt_light.cpp
+++ b/esphome/components/mqtt/mqtt_light.cpp
@@ -67,6 +67,9 @@ void MQTTJSONLightComponent::send_discovery(JsonObject root, mqtt::SendDiscovery
   if (traits.supports_color_mode(ColorMode::RGB_COLD_WARM_WHITE))
     color_modes.add(ESPHOME_F("rgbww"));
 
+  if (traits.supports_color_capability(ColorCapability::BRIGHTNESS))
+    root[ESPHOME_F("brightness")] = true;
+
   if (traits.supports_color_mode(ColorMode::COLOR_TEMPERATURE) ||
       traits.supports_color_mode(ColorMode::COLD_WARM_WHITE)) {
     root[MQTT_MIN_MIREDS] = traits.get_min_mireds();