diff --git a/compositor/main.c b/compositor/main.c
index 58b52d0d..58ecdb68 100644
--- a/compositor/main.c
+++ b/compositor/main.c
@@ -1251,6 +1251,29 @@ wet_output_set_transform(struct weston_output *output,
 	return 0;
 }
 
+static int
+wet_output_set_renderer_shadow(struct weston_output *output,
+			       struct weston_config_section *section)
+{
+	bool use_shadow = false;
+
+	if (section) {
+		weston_config_section_get_bool(section,
+					       "use-renderer-shadow",
+					       &use_shadow, false);
+	}
+
+	if (use_shadow) {
+		if (!weston_output_set_renderer_shadow_buffer(output)) {
+			weston_log("Output \"%s\" does not support use-renderer-shadow.\n",
+				   output->name);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
 static void
 allow_content_protection(struct weston_output *output,
 			struct weston_config_section *section)
@@ -1768,6 +1791,9 @@ drm_backend_output_configure(struct weston_output *output,
 
 	allow_content_protection(output, section);
 
+	if (wet_output_set_renderer_shadow(output, section) < 0)
+		return -1;
+
 	return 0;
 }
 
@@ -2578,6 +2604,12 @@ headless_backend_output_configure(struct weston_output *output)
 		.scale = 1,
 		.transform = WL_OUTPUT_TRANSFORM_NORMAL
 	};
+	struct weston_config *wc = wet_get_config(output->compositor);
+	struct weston_config_section *section;
+
+	section = weston_config_get_section(wc, "output", "name", output->name);
+	if (wet_output_set_renderer_shadow(output, section) < 0)
+		return -1;
 
 	return wet_configure_windowed_output_from_config(output, &defaults);
 }
diff --git a/man/weston.ini.man b/man/weston.ini.man
index 202d6c57..423448ad 100644
--- a/man/weston.ini.man
+++ b/man/weston.ini.man
@@ -551,6 +551,19 @@ A comma separated list of the IDs of applications to place on this output.
 These IDs should match the application IDs as set with the xdg_shell.set_app_id
 request. Currently, this option is supported by kiosk-shell.
 .RE
+.TP 7
+.BI "use-renderer-shadow=" boolean
+Use a shadow framebuffer enabling two-pass composition for possible color
+mangling operations. This is an experimental feature that is only available
+on GL-renderer combined with headless or DRM backend. Setting this to true may
+turn on various composite rendering effects and/or stop composite-bypass in
+DRM-backend.
+
+.I Only for developer testing.
+
+Defaults to
+.BR false .
+.RE
 .SH "INPUT-METHOD SECTION"
 .TP 7
 .BI "path=" "@weston_libexecdir@/weston-keyboard"