diff --git a/components/control_plane/CMakeLists.txt b/components/control_plane/CMakeLists.txt
index 34c49a1..93d10d5 100644
--- a/components/control_plane/CMakeLists.txt
+++ b/components/control_plane/CMakeLists.txt
@@ -13,6 +13,7 @@ idf_component_register(
         "src/runtime/control_plane_connectivity_runtime.c"
         "src/runtime/control_plane_fortune_service.c"
         "src/runtime/control_plane_system_events.c"
+        "src/runtime/control_plane_light_standby.c"
         "src/runtime/control_plane_key_input.c"
         "src/runtime/control_plane_reset_service.c"
         "src/runtime/control_plane_remote_log_service.c"
diff --git a/components/control_plane/include/control_plane.h b/components/control_plane/include/control_plane.h
index 845ce9a..d93d873 100644
--- a/components/control_plane/include/control_plane.h
+++ b/components/control_plane/include/control_plane.h
@@ -8,6 +8,7 @@
 
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdint.h>
 #include "esp_err.h"
 
 #ifdef __cplusplus
@@ -89,6 +90,35 @@ typedef struct {
     esp_err_t last_error;
 } control_plane_ota_snapshot_t;
 
+typedef enum {
+    CONTROL_PLANE_LIGHT_STANDBY_STATE_DISABLED = 0,
+    CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE,
+    CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING,
+    CONTROL_PLANE_LIGHT_STANDBY_STATE_STANDBY,
+    CONTROL_PLANE_LIGHT_STANDBY_STATE_WAKING,
+    CONTROL_PLANE_LIGHT_STANDBY_STATE_STOPPED,
+} control_plane_light_standby_state_t;
+
+typedef enum {
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_UNSPECIFIED = 0,
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_KEY,
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_LOCAL_WAKE,
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_VOICE_INPUT,
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_VOICE_OUTPUT,
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_MODEL_COMMAND,
+    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_EXTERNAL,
+} control_plane_light_standby_activity_t;
+
+typedef struct {
+    control_plane_light_standby_state_t state;
+    control_plane_light_standby_activity_t last_activity;
+    bool running;
+    uint32_t idle_timeout_ms;
+    uint64_t last_activity_ms;
+    uint64_t standby_since_ms;
+    uint32_t transition_count;
+} control_plane_light_standby_snapshot_t;
+
 esp_err_t control_plane_init(void);
 
 /**
@@ -109,6 +139,38 @@ esp_err_t control_plane_battery_service_start(void);
  */
 esp_err_t control_plane_prepare_runtime_storage(void);
 
+/**
+ * @brief Start the control-plane owned light-standby coordinator.
+ *
+ * The coordinator tracks one inactivity deadline for the full runtime. Phase
+ * one records state transitions only; hardware power policies are attached in
+ * later phases. Repeated starts are idempotent.
+ */
+esp_err_t control_plane_light_standby_start(void);
+
+/**
+ * @brief Stop the light-standby coordinator with bounded teardown.
+ *
+ * Zero requests asynchronous stop. Positive values wait up to the supplied
+ * timeout and apply deterministic task teardown if necessary.
+ */
+esp_err_t control_plane_light_standby_stop(int timeout_ms);
+
+/**
+ * @brief Record user activity and return the coordinator to ACTIVE state.
+ *
+ * This call is non-blocking and safe from control-plane worker tasks. It must
+ * not be called directly from an ISR.
+ */
+esp_err_t control_plane_light_standby_record_activity(
+        control_plane_light_standby_activity_t activity);
+
+/**
+ * @brief Copy the current light-standby state snapshot.
+ */
+esp_err_t control_plane_light_standby_get_snapshot(
+        control_plane_light_standby_snapshot_t *out_snapshot);
+
 /**
  * @brief Parse one direction command without side effects.
  *
diff --git a/components/control_plane/src/multimodal/control_plane_multimodal_local_wake.c b/components/control_plane/src/multimodal/control_plane_multimodal_local_wake.c
index a47b32e..f7f080a 100644
--- a/components/control_plane/src/multimodal/control_plane_multimodal_local_wake.c
+++ b/components/control_plane/src/multimodal/control_plane_multimodal_local_wake.c
@@ -322,6 +322,8 @@ static void local_wake_handle_detection(
              (unsigned)event->confidence_x10000,
              (unsigned)event->detection_generation);
 
+    (void)control_plane_light_standby_record_activity(
+            CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_LOCAL_WAKE);
     control_plane_set_ptt_active_from_local_wake();
 }
 
diff --git a/components/control_plane/src/multimodal/control_plane_multimodal_runtime.c b/components/control_plane/src/multimodal/control_plane_multimodal_runtime.c
index 0cdf5b2..2031d08 100644
--- a/components/control_plane/src/multimodal/control_plane_multimodal_runtime.c
+++ b/components/control_plane/src/multimodal/control_plane_multimodal_runtime.c
@@ -870,6 +870,21 @@ static void control_plane_multimodal_event_bridge(control_plane_multimodal_event
 {
     (void)user_data;
 
+    switch (event) {
+        case CONTROL_PLANE_MULTIMODAL_EVENT_SPEECH_STARTED:
+        case CONTROL_PLANE_MULTIMODAL_EVENT_SPEECH_ENDED:
+            (void)control_plane_light_standby_record_activity(
+                    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_VOICE_INPUT);
+            break;
+        case CONTROL_PLANE_MULTIMODAL_EVENT_RESPONDING_STARTED:
+        case CONTROL_PLANE_MULTIMODAL_EVENT_RESPONDING_ENDED:
+            (void)control_plane_light_standby_record_activity(
+                    CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_VOICE_OUTPUT);
+            break;
+        default:
+            break;
+    }
+
     switch (event) {
         case CONTROL_PLANE_MULTIMODAL_EVENT_TRANSPORT_CONNECTED: {
             control_plane_schedule_server_success_prompt();
diff --git a/components/control_plane/src/runtime/control_plane_light_standby.c b/components/control_plane/src/runtime/control_plane_light_standby.c
new file mode 100644
index 0000000..b44d0e4
--- /dev/null
+++ b/components/control_plane/src/runtime/control_plane_light_standby.c
@@ -0,0 +1,429 @@
+/*
+ * SPDX-FileCopyrightText: 2024-2026 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include "control_plane_internal.h"
+
+#include <inttypes.h>
+#include <stdbool.h>
+#include <stdint.h>
+
+#include "esp_log.h"
+#include "esp_timer.h"
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "sdkconfig.h"
+
+#ifndef CONFIG_TQ_LIGHT_STANDBY_ENABLE
+#define CONFIG_TQ_LIGHT_STANDBY_ENABLE 0
+#endif
+
+#ifndef CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS
+#define CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS 300000
+#endif
+
+#ifndef CONFIG_TQ_LIGHT_STANDBY_TASK_STACK_BYTES
+#define CONFIG_TQ_LIGHT_STANDBY_TASK_STACK_BYTES 3072
+#endif
+
+#ifndef CONFIG_TQ_LIGHT_STANDBY_TASK_PRIORITY
+#define CONFIG_TQ_LIGHT_STANDBY_TASK_PRIORITY 3
+#endif
+
+#ifndef CONFIG_TQ_LOCAL_TASK_CORE
+#define CONFIG_TQ_LOCAL_TASK_CORE 1
+#endif
+
+#define CONTROL_PLANE_LIGHT_STANDBY_ELIGIBILITY_RECHECK_MS 1000U
+#define CONTROL_PLANE_LIGHT_STANDBY_STOP_POLL_MS 20U
+
+#if CONFIG_TQ_LOCAL_TASK_CORE < 0
+#define CONTROL_PLANE_LIGHT_STANDBY_TASK_CORE tskNO_AFFINITY
+#else
+#define CONTROL_PLANE_LIGHT_STANDBY_TASK_CORE ((BaseType_t)CONFIG_TQ_LOCAL_TASK_CORE)
+#endif
+
+typedef struct {
+    TaskHandle_t task;
+    control_plane_light_standby_state_t state;
+    control_plane_light_standby_activity_t last_activity;
+    bool running;
+    bool stop_requested;
+    uint64_t last_activity_ms;
+    uint64_t standby_since_ms;
+    uint32_t transition_count;
+} control_plane_light_standby_runtime_t;
+
+static const char *TAG = "cp_light_standby";
+static control_plane_light_standby_runtime_t s_standby;
+static portMUX_TYPE s_standby_lock = portMUX_INITIALIZER_UNLOCKED;
+
+static uint64_t control_plane_light_standby_now_ms(void)
+{
+    return (uint64_t)(esp_timer_get_time() / 1000);
+}
+
+static const char *control_plane_light_standby_state_name(
+        control_plane_light_standby_state_t state)
+{
+    switch (state) {
+    case CONTROL_PLANE_LIGHT_STANDBY_STATE_DISABLED:
+        return "DISABLED";
+    case CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE:
+        return "ACTIVE";
+    case CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING:
+        return "ENTERING";
+    case CONTROL_PLANE_LIGHT_STANDBY_STATE_STANDBY:
+        return "STANDBY";
+    case CONTROL_PLANE_LIGHT_STANDBY_STATE_WAKING:
+        return "WAKING";
+    case CONTROL_PLANE_LIGHT_STANDBY_STATE_STOPPED:
+        return "STOPPED";
+    default:
+        return "UNKNOWN";
+    }
+}
+
+static const char *control_plane_light_standby_activity_name(
+        control_plane_light_standby_activity_t activity)
+{
+    switch (activity) {
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_KEY:
+        return "key";
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_LOCAL_WAKE:
+        return "local_wake";
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_VOICE_INPUT:
+        return "voice_input";
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_VOICE_OUTPUT:
+        return "voice_output";
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_MODEL_COMMAND:
+        return "model_command";
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_EXTERNAL:
+        return "external";
+    case CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_UNSPECIFIED:
+    default:
+        return "unspecified";
+    }
+}
+
+static void control_plane_light_standby_log_transition(
+        control_plane_light_standby_state_t from,
+        control_plane_light_standby_state_t to,
+        const char *reason)
+{
+    ESP_LOGI(TAG,
+             "State %s -> %s reason=%s",
+             control_plane_light_standby_state_name(from),
+             control_plane_light_standby_state_name(to),
+             reason != NULL ? reason : "-");
+}
+
+static bool control_plane_light_standby_runtime_is_eligible(void)
+{
+    if (!control_plane_voice_turn_is_idle() ||
+        !control_plane_ota_voice_services_allowed() ||
+        control_plane_is_mini_program_provisioning_running()) {
+        return false;
+    }
+
+    control_plane_multimodal_runtime_state_t state = {0};
+    if (control_plane_multimodal_get_runtime_state(&state) != ESP_OK) {
+        return true;
+    }
+    return !state.remote_responding &&
+           !state.client_speech_active &&
+           !state.request_to_speak_pending &&
+           !state.response_pending &&
+           !state.local_responding_started;
+}
+
+static void control_plane_light_standby_enter(uint64_t now_ms)
+{
+    control_plane_light_standby_state_t from = CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE;
+    bool entering = false;
+
+    portENTER_CRITICAL(&s_standby_lock);
+    if (s_standby.running && !s_standby.stop_requested &&
+        s_standby.state == CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE &&
+        (now_ms - s_standby.last_activity_ms) >=
+                (uint64_t)CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS) {
+        from = s_standby.state;
+        s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING;
+        s_standby.transition_count++;
+        entering = true;
+    }
+    portEXIT_CRITICAL(&s_standby_lock);
+
+    if (!entering) {
+        return;
+    }
+    control_plane_light_standby_log_transition(from,
+                                                CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING,
+                                                "idle_timeout");
+
+    bool entered = false;
+    portENTER_CRITICAL(&s_standby_lock);
+    if (s_standby.state == CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING &&
+        !s_standby.stop_requested) {
+        s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_STANDBY;
+        s_standby.standby_since_ms = now_ms;
+        s_standby.transition_count++;
+        entered = true;
+    }
+    portEXIT_CRITICAL(&s_standby_lock);
+
+    if (entered) {
+        control_plane_light_standby_log_transition(
+                CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING,
+                CONTROL_PLANE_LIGHT_STANDBY_STATE_STANDBY,
+                "phase1_state_only");
+    }
+}
+
+static void control_plane_light_standby_task(void *arg)
+{
+    (void)arg;
+    ESP_LOGI(TAG,
+             "Coordinator started idle_timeout_ms=%u",
+             (unsigned)CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS);
+
+    while (true) {
+        uint64_t last_activity_ms = 0U;
+        bool stop_requested = false;
+        control_plane_light_standby_state_t state =
+                CONTROL_PLANE_LIGHT_STANDBY_STATE_STOPPED;
+
+        portENTER_CRITICAL(&s_standby_lock);
+        last_activity_ms = s_standby.last_activity_ms;
+        stop_requested = s_standby.stop_requested;
+        state = s_standby.state;
+        portEXIT_CRITICAL(&s_standby_lock);
+
+        if (stop_requested) {
+            break;
+        }
+        if (state == CONTROL_PLANE_LIGHT_STANDBY_STATE_STANDBY) {
+            (void)ulTaskNotifyTake(
+                    pdTRUE,
+                    pdMS_TO_TICKS(CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS));
+            continue;
+        }
+
+        uint64_t now_ms = control_plane_light_standby_now_ms();
+        uint64_t idle_ms = now_ms - last_activity_ms;
+        if (idle_ms >= (uint64_t)CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS) {
+            if (control_plane_light_standby_runtime_is_eligible()) {
+                control_plane_light_standby_enter(now_ms);
+            }
+            (void)ulTaskNotifyTake(
+                    pdTRUE,
+                    pdMS_TO_TICKS(CONTROL_PLANE_LIGHT_STANDBY_ELIGIBILITY_RECHECK_MS));
+            continue;
+        }
+
+        uint64_t remaining_ms =
+                (uint64_t)CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS - idle_ms;
+        TickType_t wait_ticks = pdMS_TO_TICKS((uint32_t)remaining_ms);
+        if (wait_ticks == 0U) {
+            wait_ticks = 1U;
+        }
+        (void)ulTaskNotifyTake(pdTRUE, wait_ticks);
+    }
+
+    portENTER_CRITICAL(&s_standby_lock);
+    s_standby.task = NULL;
+    s_standby.running = false;
+    s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_STOPPED;
+    s_standby.transition_count++;
+    portEXIT_CRITICAL(&s_standby_lock);
+    ESP_LOGI(TAG, "Coordinator stopped");
+    vTaskDelete(NULL);
+}
+
+esp_err_t control_plane_light_standby_start(void)
+{
+#if !CONFIG_TQ_LIGHT_STANDBY_ENABLE
+    return ESP_ERR_NOT_SUPPORTED;
+#else
+    uint64_t now_ms = control_plane_light_standby_now_ms();
+    portENTER_CRITICAL(&s_standby_lock);
+    if (s_standby.running) {
+        portEXIT_CRITICAL(&s_standby_lock);
+        return ESP_OK;
+    }
+    s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE;
+    s_standby.last_activity = CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_UNSPECIFIED;
+    s_standby.running = true;
+    s_standby.stop_requested = false;
+    s_standby.last_activity_ms = now_ms;
+    s_standby.standby_since_ms = 0U;
+    s_standby.transition_count = 0U;
+    portEXIT_CRITICAL(&s_standby_lock);
+
+    TaskHandle_t task = NULL;
+    BaseType_t created = xTaskCreatePinnedToCore(
+            control_plane_light_standby_task,
+            "cp_light_standby",
+            CONFIG_TQ_LIGHT_STANDBY_TASK_STACK_BYTES,
+            NULL,
+            CONFIG_TQ_LIGHT_STANDBY_TASK_PRIORITY,
+            &task,
+            CONTROL_PLANE_LIGHT_STANDBY_TASK_CORE);
+    if (created != pdPASS) {
+        portENTER_CRITICAL(&s_standby_lock);
+        s_standby.running = false;
+        s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_STOPPED;
+        portEXIT_CRITICAL(&s_standby_lock);
+        return ESP_ERR_NO_MEM;
+    }
+
+    portENTER_CRITICAL(&s_standby_lock);
+    s_standby.task = task;
+    portEXIT_CRITICAL(&s_standby_lock);
+    return ESP_OK;
+#endif
+}
+
+esp_err_t control_plane_light_standby_stop(int timeout_ms)
+{
+    if (timeout_ms < 0) {
+        return ESP_ERR_INVALID_ARG;
+    }
+#if !CONFIG_TQ_LIGHT_STANDBY_ENABLE
+    return ESP_OK;
+#else
+    TaskHandle_t task = NULL;
+    portENTER_CRITICAL(&s_standby_lock);
+    if (!s_standby.running) {
+        portEXIT_CRITICAL(&s_standby_lock);
+        return ESP_OK;
+    }
+    s_standby.stop_requested = true;
+    task = s_standby.task;
+    portEXIT_CRITICAL(&s_standby_lock);
+
+    if (task != NULL) {
+        xTaskNotifyGive(task);
+    }
+    if (timeout_ms == 0) {
+        return ESP_OK;
+    }
+
+    uint64_t deadline_ms = control_plane_light_standby_now_ms() + (uint64_t)timeout_ms;
+    while (control_plane_light_standby_now_ms() < deadline_ms) {
+        bool running = false;
+        portENTER_CRITICAL(&s_standby_lock);
+        running = s_standby.running;
+        portEXIT_CRITICAL(&s_standby_lock);
+        if (!running) {
+            return ESP_OK;
+        }
+        vTaskDelay(pdMS_TO_TICKS(CONTROL_PLANE_LIGHT_STANDBY_STOP_POLL_MS));
+    }
+
+    portENTER_CRITICAL(&s_standby_lock);
+    task = s_standby.task;
+    s_standby.task = NULL;
+    s_standby.running = false;
+    s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_STOPPED;
+    s_standby.transition_count++;
+    portEXIT_CRITICAL(&s_standby_lock);
+    if (task != NULL) {
+        ESP_LOGW(TAG, "Coordinator stop timed out; forcing task teardown");
+        vTaskDelete(task);
+    }
+    return ESP_ERR_TIMEOUT;
+#endif
+}
+
+esp_err_t control_plane_light_standby_record_activity(
+        control_plane_light_standby_activity_t activity)
+{
+    if (activity <= CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_UNSPECIFIED ||
+        activity > CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_EXTERNAL) {
+        return ESP_ERR_INVALID_ARG;
+    }
+#if !CONFIG_TQ_LIGHT_STANDBY_ENABLE
+    return ESP_ERR_NOT_SUPPORTED;
+#else
+    control_plane_light_standby_state_t from = CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE;
+    TaskHandle_t task = NULL;
+    bool waking = false;
+    uint64_t now_ms = control_plane_light_standby_now_ms();
+
+    portENTER_CRITICAL(&s_standby_lock);
+    if (!s_standby.running || s_standby.stop_requested) {
+        portEXIT_CRITICAL(&s_standby_lock);
+        return ESP_ERR_INVALID_STATE;
+    }
+    s_standby.last_activity = activity;
+    s_standby.last_activity_ms = now_ms;
+    task = s_standby.task;
+    if (s_standby.state == CONTROL_PLANE_LIGHT_STANDBY_STATE_STANDBY ||
+        s_standby.state == CONTROL_PLANE_LIGHT_STANDBY_STATE_ENTERING) {
+        from = s_standby.state;
+        s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_WAKING;
+        s_standby.transition_count++;
+        waking = true;
+    }
+    portEXIT_CRITICAL(&s_standby_lock);
+
+    if (waking) {
+        const char *reason = control_plane_light_standby_activity_name(activity);
+        control_plane_light_standby_log_transition(
+                from,
+                CONTROL_PLANE_LIGHT_STANDBY_STATE_WAKING,
+                reason);
+
+        bool activated = false;
+        portENTER_CRITICAL(&s_standby_lock);
+        if (s_standby.state == CONTROL_PLANE_LIGHT_STANDBY_STATE_WAKING) {
+            s_standby.state = CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE;
+            s_standby.standby_since_ms = 0U;
+            s_standby.transition_count++;
+            activated = true;
+        }
+        portEXIT_CRITICAL(&s_standby_lock);
+        if (activated) {
+            control_plane_light_standby_log_transition(
+                    CONTROL_PLANE_LIGHT_STANDBY_STATE_WAKING,
+                    CONTROL_PLANE_LIGHT_STANDBY_STATE_ACTIVE,
+                    reason);
+        }
+    }
+
+    if (task != NULL) {
+        xTaskNotifyGive(task);
+    }
+    return ESP_OK;
+#endif
+}
+
+esp_err_t control_plane_light_standby_get_snapshot(
+        control_plane_light_standby_snapshot_t *out_snapshot)
+{
+    if (out_snapshot == NULL) {
+        return ESP_ERR_INVALID_ARG;
+    }
+
+    portENTER_CRITICAL(&s_standby_lock);
+#if CONFIG_TQ_LIGHT_STANDBY_ENABLE
+    *out_snapshot = (control_plane_light_standby_snapshot_t) {
+        .state = s_standby.state,
+        .last_activity = s_standby.last_activity,
+        .running = s_standby.running,
+        .idle_timeout_ms = CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS,
+        .last_activity_ms = s_standby.last_activity_ms,
+        .standby_since_ms = s_standby.standby_since_ms,
+        .transition_count = s_standby.transition_count,
+    };
+#else
+    *out_snapshot = (control_plane_light_standby_snapshot_t) {
+        .state = CONTROL_PLANE_LIGHT_STANDBY_STATE_DISABLED,
+    };
+#endif
+    portEXIT_CRITICAL(&s_standby_lock);
+    return ESP_OK;
+}
diff --git a/components/control_plane/src/runtime/control_plane_runtime_workers.c b/components/control_plane/src/runtime/control_plane_runtime_workers.c
index 1df20d3..58683a6 100644
--- a/components/control_plane/src/runtime/control_plane_runtime_workers.c
+++ b/components/control_plane/src/runtime/control_plane_runtime_workers.c
@@ -1212,6 +1212,9 @@ static void control_plane_model_command_task(void *arg)
             break;
         }
 
+        (void)control_plane_light_standby_record_activity(
+                CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_MODEL_COMMAND);
+
         if (cmd.command_type == CONTROL_PLANE_MODEL_COMMAND_DIRECTION) {
             size_t direction_index = 0;
             control_plane_direction_command_t parsed = control_plane_parse_direction_command(cmd.value,
@@ -2536,6 +2539,12 @@ esp_err_t control_plane_start_runtime_workers(void)
         return system_event_err;
     }
 
+    esp_err_t standby_err = control_plane_light_standby_start();
+    if (standby_err != ESP_OK && standby_err != ESP_ERR_NOT_SUPPORTED) {
+        control_plane_stop_runtime_workers();
+        return standby_err;
+    }
+
     esp_err_t key_input_err = control_plane_start_key_input_task();
     if (key_input_err != ESP_OK) {
         control_plane_stop_runtime_workers();
@@ -2620,6 +2629,7 @@ void control_plane_stop_event_observer_runtime(void)
 void control_plane_stop_runtime_workers(void)
 {
     control_plane_set_runtime_stop_requested(true);
+    (void)control_plane_light_standby_stop(CONTROL_PLANE_TASK_STOP_WAIT_MS);
     (void)control_plane_battery_service_stop(CONTROL_PLANE_TASK_STOP_WAIT_MS);
     (void)control_plane_stop_ota_service(CONFIG_TQ_LOCAL_WAKE_STOP_WAIT_MS);
     (void)control_plane_stop_mini_program_provisioning(
diff --git a/components/control_plane/src/runtime/control_plane_system_events.c b/components/control_plane/src/runtime/control_plane_system_events.c
index 66cdfbe..1bfc6cd 100644
--- a/components/control_plane/src/runtime/control_plane_system_events.c
+++ b/components/control_plane/src/runtime/control_plane_system_events.c
@@ -130,6 +130,9 @@ static void control_plane_dispatch_key_event(const control_plane_key_event_t *ev
              event->press_duration_ms,
              event->click_count);
 
+    (void)control_plane_light_standby_record_activity(
+            CONTROL_PLANE_LIGHT_STANDBY_ACTIVITY_KEY);
+
     if (event->key_id == CONTROL_PLANE_KEY_ID_RESET) {
         if (event->type == CONTROL_PLANE_KEY_EVENT_LONG_PRESS_START) {
             control_plane_reset_wifi_provisioning_and_restart();
diff --git a/main/Kconfig.projbuild b/main/Kconfig.projbuild
index 13d15d8..0452d40 100644
--- a/main/Kconfig.projbuild
+++ b/main/Kconfig.projbuild
@@ -323,6 +323,39 @@ menu "Example Configuration"
             help
                 Stack size in bytes for the control-plane system event task.
 
+        menu "Light Standby"
+
+            config TQ_LIGHT_STANDBY_ENABLE
+                bool "Enable light-standby state coordinator"
+                default y
+                help
+                    Track a single device-wide inactivity deadline and expose
+                    ACTIVE, ENTERING, STANDBY, and WAKING states. Hardware power
+                    actions are attached to these transitions separately.
+
+            config TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS
+                int "Light-standby inactivity timeout (ms)"
+                default 300000
+                range 1000 3600000
+                depends on TQ_LIGHT_STANDBY_ENABLE
+                help
+                    Time without key, local-wake, or voice interaction before
+                    entering light standby. The production default is 5 minutes.
+
+            config TQ_LIGHT_STANDBY_TASK_STACK_BYTES
+                int "Light-standby task stack size (bytes)"
+                default 3072
+                range 2048 8192
+                depends on TQ_LIGHT_STANDBY_ENABLE
+
+            config TQ_LIGHT_STANDBY_TASK_PRIORITY
+                int "Light-standby task priority"
+                default 3
+                range 1 10
+                depends on TQ_LIGHT_STANDBY_ENABLE
+
+        endmenu
+
         menu "Remote Logging"
 
             config TQ_REMOTE_LOG_ENABLE
diff --git a/sdkconfig.defaults b/sdkconfig.defaults
index 0d101b0..a59a0c8 100644
--- a/sdkconfig.defaults
+++ b/sdkconfig.defaults
@@ -50,6 +50,10 @@ CONFIG_TQ_NETWORK_AUTO_REASSOCIATION_ENABLE=y
 CONFIG_TQ_SYSTEM_EVENT_ENABLE=y
 CONFIG_TQ_SYSTEM_EVENT_QUEUE_LEN=32
 CONFIG_TQ_SYSTEM_EVENT_TASK_STACK=4096
+CONFIG_TQ_LIGHT_STANDBY_ENABLE=y
+CONFIG_TQ_LIGHT_STANDBY_IDLE_TIMEOUT_MS=300000
+CONFIG_TQ_LIGHT_STANDBY_TASK_STACK_BYTES=3072
+CONFIG_TQ_LIGHT_STANDBY_TASK_PRIORITY=3
 CONFIG_TQ_REMOTE_LOG_ENABLE=y
 CONFIG_TQ_REMOTE_LOG_ENDPOINT="http://47.98.175.183:8090/log/batch"
 CONFIG_TQ_REMOTE_LOG_AUTH_TOKEN=""