diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 8f80e65c..d0bdfcd5 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -211,13 +211,13 @@ static void wlr_drm_connector_swap_buffers(struct wlr_output *output) {
 }
 
 static void wlr_drm_connector_set_gamma(struct wlr_output *output,
-		uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
+		uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
 	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
 	drmModeCrtcSetGamma(drm->fd, conn->crtc->id, size, r, g, b);
 }
 
-static uint16_t wlr_drm_connector_get_gamma_size(struct wlr_output *output) {
+static uint32_t wlr_drm_connector_get_gamma_size(struct wlr_output *output) {
 	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
 	drmModeCrtc *crtc = conn->old_crtc;
 	return crtc ? crtc->gamma_size : 0;
diff --git a/include/wlr/interfaces/wlr_output.h b/include/wlr/interfaces/wlr_output.h
index 338d3375..636cc06c 100644
--- a/include/wlr/interfaces/wlr_output.h
+++ b/include/wlr/interfaces/wlr_output.h
@@ -18,8 +18,8 @@ struct wlr_output_impl {
 	void (*make_current)(struct wlr_output *output);
 	void (*swap_buffers)(struct wlr_output *output);
 	void (*set_gamma)(struct wlr_output *output,
-		uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b);
-	uint16_t (*get_gamma_size)(struct wlr_output *output);
+		uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
+	uint32_t (*get_gamma_size)(struct wlr_output *output);
 };
 
 void wlr_output_init(struct wlr_output *output, struct wlr_backend *backend,
diff --git a/include/wlr/types/wlr_gamma_control.h b/include/wlr/types/wlr_gamma_control.h
index 96c9f545..59f18494 100644
--- a/include/wlr/types/wlr_gamma_control.h
+++ b/include/wlr/types/wlr_gamma_control.h
@@ -5,18 +5,28 @@
 
 struct wlr_gamma_control_manager {
 	struct wl_global *wl_global;
+	struct wl_list controls; // list of wlr_gamma_control
 
 	void *data;
 };
 
 struct wlr_gamma_control {
 	struct wl_resource *resource;
-	struct wl_resource *output;
+	struct wlr_output *output;
+	struct wl_list link;
+
+	struct wl_listener output_destroy_listener;
+
+	struct {
+		struct wl_signal destroy;
+	} events;
 
 	void* data;
 };
 
-struct wlr_gamma_control_manager *wlr_gamma_control_manager_create(struct wl_display *display);
-void wlr_gamma_control_manager_destroy(struct wlr_gamma_control_manager *gamma_control_manager);
+struct wlr_gamma_control_manager *wlr_gamma_control_manager_create(
+	struct wl_display *display);
+void wlr_gamma_control_manager_destroy(
+	struct wlr_gamma_control_manager *gamma_control_manager);
 
 #endif
diff --git a/include/wlr/types/wlr_output.h b/include/wlr/types/wlr_output.h
index d8649bbb..74eb15ed 100644
--- a/include/wlr/types/wlr_output.h
+++ b/include/wlr/types/wlr_output.h
@@ -84,7 +84,7 @@ void wlr_output_effective_resolution(struct wlr_output *output,
 void wlr_output_make_current(struct wlr_output *output);
 void wlr_output_swap_buffers(struct wlr_output *output);
 void wlr_output_set_gamma(struct wlr_output *output,
-	uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b);
-uint16_t wlr_output_get_gamma_size(struct wlr_output *output);
+	uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b);
+uint32_t wlr_output_get_gamma_size(struct wlr_output *output);
 
 #endif
diff --git a/types/wlr_gamma_control.c b/types/wlr_gamma_control.c
index 973fd613..9d74e749 100644
--- a/types/wlr_gamma_control.c
+++ b/types/wlr_gamma_control.c
@@ -6,96 +6,155 @@
 #include <wlr/util/log.h>
 #include "gamma-control-protocol.h"
 
-static void resource_destroy(struct wl_client *client, struct wl_resource *resource) {
+static void resource_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
 	wl_resource_destroy(resource);
 }
 
-static void gamma_control_destroy(struct wl_resource *resource) {
-	struct wlr_gamma_control *gamma_control = wl_resource_get_user_data(resource);
+static void gamma_control_destroy(struct wlr_gamma_control *gamma_control) {
+	wl_signal_emit(&gamma_control->events.destroy, gamma_control);
+	wl_list_remove(&gamma_control->output_destroy_listener.link);
+	wl_resource_set_user_data(gamma_control->resource, NULL);
 	free(gamma_control);
 }
 
+static void gamma_control_destroy_resource(struct wl_resource *resource) {
+	struct wlr_gamma_control *gamma_control =
+		wl_resource_get_user_data(resource);
+	gamma_control_destroy(gamma_control);
+}
+
+static void gamma_control_handle_output_destroy(struct wl_listener *listener,
+		void *data) {
+	struct wlr_gamma_control *gamma_control =
+		wl_container_of(listener, gamma_control, output_destroy_listener);
+	gamma_control_destroy(gamma_control);
+}
+
 static void gamma_control_set_gamma(struct wl_client *client,
-		struct wl_resource *_gamma_control, struct wl_array *red,
+		struct wl_resource *gamma_control_resource, struct wl_array *red,
 		struct wl_array *green, struct wl_array *blue) {
+	struct wlr_gamma_control *gamma_control =
+		wl_resource_get_user_data(gamma_control_resource);
+
 	if (red->size != green->size || red->size != blue->size) {
-		wl_resource_post_error(_gamma_control, GAMMA_CONTROL_ERROR_INVALID_GAMMA,
+		wl_resource_post_error(gamma_control_resource,
+			GAMMA_CONTROL_ERROR_INVALID_GAMMA,
 			"The gamma ramps don't have the same size");
 		return;
 	}
+
+	uint32_t size = red->size / sizeof(uint16_t);
 	uint16_t *r = (uint16_t *)red->data;
 	uint16_t *g = (uint16_t *)green->data;
 	uint16_t *b = (uint16_t *)blue->data;
-	struct wlr_gamma_control *gamma_control = wl_resource_get_user_data(_gamma_control);
-	struct wlr_output *output = wl_resource_get_user_data(gamma_control->output);
-	wlr_output_set_gamma(output, red->size / sizeof(uint16_t), r, g, b);
+
+	wlr_output_set_gamma(gamma_control->output, size, r, g, b);
 }
 
 static void gamma_control_reset_gamma(struct wl_client *client,
-		struct wl_resource *_gamma_control) {
+		struct wl_resource *gamma_control_resource) {
 	// TODO
 }
 
-static const struct gamma_control_interface gamma_control_implementation = {
+static const struct gamma_control_interface gamma_control_impl = {
 	.destroy = resource_destroy,
 	.set_gamma = gamma_control_set_gamma,
 	.reset_gamma = gamma_control_reset_gamma,
 };
 
 static void gamma_control_manager_get_gamma_control(struct wl_client *client,
-		struct wl_resource *_gamma_control_manager, uint32_t id,
-		struct wl_resource *_output) {
-	//struct wlr_gamma_control_manager *gamma_control_manager =
-	//	wl_resource_get_user_data(_gamma_control_manager);
-	struct wlr_output *output = wl_resource_get_user_data(_output);
-	struct wlr_gamma_control *gamma_control;
-	if (!(gamma_control = calloc(1, sizeof(struct wlr_gamma_control)))) {
+		struct wl_resource *gamma_control_manager_resource, uint32_t id,
+		struct wl_resource *output_resource) {
+	struct wlr_gamma_control_manager *gamma_control_manager =
+		wl_resource_get_user_data(gamma_control_manager_resource);
+	struct wlr_output *output = wl_resource_get_user_data(output_resource);
+
+	struct wlr_gamma_control *gamma_control =
+		calloc(1, sizeof(struct wlr_gamma_control));
+	if (gamma_control == NULL) {
+		wl_client_post_no_memory(client);
 		return;
 	}
-	gamma_control->output = _output;
+	gamma_control->output = output;
+
+	int version = wl_resource_get_version(gamma_control_manager_resource);
 	gamma_control->resource = wl_resource_create(client,
-		&gamma_control_interface, wl_resource_get_version(_gamma_control_manager), id);
-	wlr_log(L_DEBUG, "new gamma_control %p (res %p)", gamma_control, gamma_control->resource);
+		&gamma_control_interface, version, id);
+	if (gamma_control->resource == NULL) {
+		wl_client_post_no_memory(client);
+		free(gamma_control);
+		return;
+	}
+	wlr_log(L_DEBUG, "new gamma_control %p (res %p)", gamma_control,
+		gamma_control->resource);
 	wl_resource_set_implementation(gamma_control->resource,
-		&gamma_control_implementation, gamma_control, gamma_control_destroy);
-	gamma_control_send_gamma_size(gamma_control->resource, wlr_output_get_gamma_size(output));
+		&gamma_control_impl, gamma_control, gamma_control_destroy_resource);
+
+	wl_signal_init(&gamma_control->events.destroy);
+
+	wl_signal_add(&output->events.destroy,
+		&gamma_control->output_destroy_listener);
+	gamma_control->output_destroy_listener.notify =
+		gamma_control_handle_output_destroy;
+
+	wl_list_insert(&gamma_control_manager->controls, &gamma_control->link);
+
+	gamma_control_send_gamma_size(gamma_control->resource,
+		wlr_output_get_gamma_size(output));
 }
 
 static struct gamma_control_manager_interface gamma_control_manager_impl = {
 	.get_gamma_control = gamma_control_manager_get_gamma_control,
 };
 
-static void gamma_control_manager_bind(struct wl_client *wl_client,
+static void gamma_control_manager_bind(struct wl_client *client,
 		void *_gamma_control_manager, uint32_t version, uint32_t id) {
-	struct wlr_gamma_control_manager *gamma_control_manager = _gamma_control_manager;
-	assert(wl_client && gamma_control_manager);
+	struct wlr_gamma_control_manager *gamma_control_manager =
+		_gamma_control_manager;
+	assert(client && gamma_control_manager);
 
-	struct wl_resource *wl_resource = wl_resource_create(
-		wl_client, &gamma_control_manager_interface, version, id);
-	wl_resource_set_implementation(wl_resource, &gamma_control_manager_impl,
+	struct wl_resource *resource = wl_resource_create(client,
+		&gamma_control_manager_interface, version, id);
+	if (resource == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+	wl_resource_set_implementation(resource, &gamma_control_manager_impl,
 		gamma_control_manager, NULL);
 }
 
-struct wlr_gamma_control_manager *wlr_gamma_control_manager_create(struct wl_display *display) {
+struct wlr_gamma_control_manager *wlr_gamma_control_manager_create(
+		struct wl_display *display) {
 	struct wlr_gamma_control_manager *gamma_control_manager =
 		calloc(1, sizeof(struct wlr_gamma_control_manager));
 	if (!gamma_control_manager) {
 		return NULL;
 	}
 	struct wl_global *wl_global = wl_global_create(display,
-		&gamma_control_manager_interface, 1, gamma_control_manager, gamma_control_manager_bind);
+		&gamma_control_manager_interface, 1, gamma_control_manager,
+		gamma_control_manager_bind);
 	if (!wl_global) {
 		free(gamma_control_manager);
 		return NULL;
 	}
 	gamma_control_manager->wl_global = wl_global;
+
+	wl_list_init(&gamma_control_manager->controls);
+
 	return gamma_control_manager;
 }
 
-void wlr_gamma_control_manager_destroy(struct wlr_gamma_control_manager *gamma_control_manager) {
+void wlr_gamma_control_manager_destroy(
+		struct wlr_gamma_control_manager *gamma_control_manager) {
 	if (!gamma_control_manager) {
 		return;
 	}
+	struct wlr_gamma_control *gamma_control, *tmp;
+	wl_list_for_each_safe(gamma_control, tmp, &gamma_control_manager->controls,
+			link) {
+		gamma_control_destroy(gamma_control);
+	}
 	// TODO: this segfault (wl_display->registry_resource_list is not init)
 	// wl_global_destroy(gamma_control_manager->wl_global);
 	free(gamma_control_manager);
diff --git a/types/wlr_output.c b/types/wlr_output.c
index eb5bdd26..a02798b2 100644
--- a/types/wlr_output.c
+++ b/types/wlr_output.c
@@ -404,13 +404,13 @@ void wlr_output_swap_buffers(struct wlr_output *output) {
 }
 
 void wlr_output_set_gamma(struct wlr_output *output,
-	uint16_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
+	uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
 	if (output->impl->set_gamma) {
 		output->impl->set_gamma(output, size, r, g, b);
 	}
 }
 
-uint16_t wlr_output_get_gamma_size(struct wlr_output *output) {
+uint32_t wlr_output_get_gamma_size(struct wlr_output *output) {
 	if (!output->impl->get_gamma_size) {
 		return 0;
 	}