diff --git a/src/dulcepan.h b/src/dulcepan.h
index 671a4de..bc97c0a 100644
--- a/src/dulcepan.h
+++ b/src/dulcepan.h
@@ -31,6 +31,8 @@ struct dp_output {
 	uint32_t global_name;
 	struct wl_output *wl_output;
 
+	char *name;
+
 	struct wl_surface *main_surface;
 	struct zwlr_layer_surface_v1 *main_layer_surface;
 	struct wp_viewport *main_viewport;
@@ -198,6 +200,7 @@ void dp_log_error(const char *fmt, ...);
 void dp_log_fatal(const char *fmt, ...);
 
 void *dp_zalloc(size_t size);
+char *dp_strdup(const char *str);
 
 const char *dp_ext_from_path(const char *path);
 enum dp_file_format dp_ext_to_format(const char *ext);
diff --git a/src/main.c b/src/main.c
index 8f82326..6ce771f 100644
--- a/src/main.c
+++ b/src/main.c
@@ -35,10 +35,10 @@ static void registry_handle_global(void *data, struct wl_registry *registry, uin
 	} else if (strcmp(interface, wl_output_interface.name) == 0) {
 		if (state->initialized) {
 			dp_log_fatal("An output was added after initialization");
-		} else if (version < 2) {
+		} else if (version < 4) {
 			dp_log_fatal("An output has too low version (%d)", version);
 		}
-		struct wl_output *global = wl_registry_bind(registry, name, &wl_output_interface, 2);
+		struct wl_output *global = wl_registry_bind(registry, name, &wl_output_interface, 4);
 		dp_output_create(state, name, global);
 	} else if (strcmp(interface, wl_seat_interface.name) == 0) {
 		struct wl_seat *global = wl_registry_bind(registry, name, &wl_seat_interface, 1);
diff --git a/src/output.c b/src/output.c
index 12c69f1..91132b1 100644
--- a/src/output.c
+++ b/src/output.c
@@ -32,8 +32,8 @@ static void layer_surface_handle_configure(void *data, struct zwlr_layer_surface
 
 	if (output->initialized) {
 		if (i_width != output->effective_width || i_height != output->effective_height) {
-			dp_log_fatal("Layer surface size has changed: %dx%d => %dx%d", output->effective_width,
-					output->effective_height, i_width, i_height);
+			dp_log_fatal("Output %s: layer surface size has changed: %dx%d => %dx%d", output->name,
+					output->effective_width, output->effective_height, i_width, i_height);
 		}
 
 		wl_surface_commit(output->main_surface);
@@ -61,7 +61,8 @@ static void layer_surface_handle_configure(void *data, struct zwlr_layer_surface
 }
 
 static void layer_surface_handle_closed(void *data, struct zwlr_layer_surface_v1 *layer_surface) {
-	dp_log_fatal("A layer surface was closed");
+	struct dp_output *output = data;
+	dp_log_fatal("Output %s: a layer surface was closed", output->name);
 }
 
 static const struct zwlr_layer_surface_v1_listener layer_surface_listener = {
@@ -104,7 +105,8 @@ static void frame_handle_ready(void *data, struct zwlr_screencopy_frame_v1 *fram
 }
 
 static void frame_handle_failed(void *data, struct zwlr_screencopy_frame_v1 *frame) {
-	dp_log_fatal("Failed to copy a frame");
+	struct dp_output *output = data;
+	dp_log_fatal("Output %s: failed to copy a frame", output->name);
 }
 
 static const struct zwlr_screencopy_frame_v1_listener frame_listener = {
@@ -130,8 +132,8 @@ static void output_handle_geometry(void *data, struct wl_output *wl_output, int3
 
 	if (output->has_geom) {
 		if (transform != output->transform) {
-			dp_log_fatal("Output transform has changed: %d (%#x) => %d (%#x)", output->transform,
-					output->transform, transform, transform);
+			dp_log_fatal("Output %s: transform has changed: %d (%#x) => %d (%#x)", output->name,
+					output->transform, output->transform, transform, transform);
 		}
 	}
 
@@ -144,8 +146,8 @@ static void output_handle_mode(void *data, struct wl_output *wl_output, uint32_t
 
 	if (output->has_geom) {
 		if (width != output->width || height != output->height) {
-			dp_log_fatal("Output mode has changed: %dx%d => %dx%d", output->width, output->height,
-					width, height);
+			dp_log_fatal("Output %s: mode has changed: %dx%d => %dx%d", output->name, output->width,
+					output->height, width, height);
 		}
 	}
 
@@ -160,6 +162,8 @@ static void output_handle_done(void *data, struct wl_output *wl_output) {
 		return;
 	}
 
+	assert(output->name != NULL);
+
 	if ((output->transform & WL_OUTPUT_TRANSFORM_90) != 0) {
 		output->transformed_width = output->height;
 		output->transformed_height = output->width;
@@ -222,11 +226,23 @@ static void output_handle_scale(void *data, struct wl_output *wl_output, int32_t
 	// Ignored
 }
 
+static void output_handle_name(void *data, struct wl_output *wl_output, const char *name) {
+	struct dp_output *output = data;
+	assert(output->name == NULL);
+	output->name = dp_strdup(name);
+}
+
+static void output_handle_description(void *data, struct wl_output *wl_output, const char *name) {
+	// Ignored
+}
+
 static const struct wl_output_listener output_listener = {
 	.geometry = output_handle_geometry,
 	.mode = output_handle_mode,
 	.done = output_handle_done,
 	.scale = output_handle_scale,
+	.name = output_handle_name,
+	.description = output_handle_description,
 };
 
 static void redraw(struct dp_output *output);
@@ -261,7 +277,7 @@ static void redraw(struct dp_output *output) {
 		}
 	}
 	if (buffer == NULL) {
-		dp_log_error("No free buffers in a swapchain\n");
+		dp_log_error("Output %s: no free buffers in a swapchain\n", output->name);
 		return;
 	}
 	buffer->used = true;
@@ -331,6 +347,8 @@ void dp_output_create(struct dp_state *state, uint32_t name, struct wl_output *w
 void dp_output_destroy(struct dp_output *output) {
 	wl_output_release(output->wl_output);
 
+	free(output->name);
+
 	assert(output->frame == NULL);
 	wl_buffer_destroy(output->frame_buffer);
 	munmap(output->frame_data, output->frame_size);
diff --git a/src/util.c b/src/util.c
index a99efe7..94790e9 100644
--- a/src/util.c
+++ b/src/util.c
@@ -35,6 +35,14 @@ void *dp_zalloc(size_t size) {
 	return ptr;
 }
 
+char *dp_strdup(const char *str) {
+	char *ptr = strdup(str);
+	if (ptr == NULL) {
+		dp_log_fatal("Failed to duplicate %s", str);
+	}
+	return ptr;
+}
+
 const char *dp_ext_from_path(const char *path) {
 	size_t len = strlen(path);
 	for (size_t i = len; i-- > 0;) {