diff --git a/alloc.c b/alloc.c
index 22c9e9d..88350e7 100644
--- a/alloc.c
+++ b/alloc.c
@@ -591,6 +591,8 @@ bool liftoff_output_apply(struct liftoff_output *output, drmModeAtomicReq *req)
 		return true;
 	}
 
+	output_log_layers(output);
+
 	/* Unset all existing plane and layer mappings. */
 	liftoff_list_for_each(plane, &device->planes, link) {
 		if (plane->layer != NULL && plane->layer->output == output) {
diff --git a/include/private.h b/include/private.h
index abd0040..bf065ce 100644
--- a/include/private.h
+++ b/include/private.h
@@ -90,4 +90,6 @@ struct liftoff_plane_property *plane_get_property(struct liftoff_plane *plane,
 bool plane_apply(struct liftoff_plane *plane, struct liftoff_layer *layer,
 		 drmModeAtomicReq *req, bool *compatible);
 
+void output_log_layers(struct liftoff_output *output);
+
 #endif
diff --git a/output.c b/output.c
index 7b1b372..23d2907 100644
--- a/output.c
+++ b/output.c
@@ -1,4 +1,5 @@
 #include <assert.h>
+#include <inttypes.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
@@ -49,3 +50,18 @@ void liftoff_output_set_composition_layer(struct liftoff_output *output,
 	}
 	output->composition_layer = layer;
 }
+
+void output_log_layers(struct liftoff_output *output) {
+	struct liftoff_layer *layer;
+	size_t i;
+
+	liftoff_log(LIFTOFF_DEBUG, "Layers on CRTC %"PRIu32":", output->crtc_id);
+	liftoff_list_for_each(layer, &output->layers, link) {
+		liftoff_log(LIFTOFF_DEBUG, "  Layer %p:", (void *)layer);
+		for (i = 0; i < layer->props_len; i++) {
+			liftoff_log(LIFTOFF_DEBUG, "    %s = %"PRIu64,
+				    layer->props[i].name,
+				    layer->props[i].value);
+		}
+	}
+}