--- mate-power-manager-1.18.1/src/gpm-brightness.c.1	2018-01-16 07:26:45.891311170 +0000
+++ mate-power-manager-1.18.1/src/gpm-brightness.c	2018-01-16 07:29:22.128743384 +0000
@@ -159,7 +159,11 @@
 	gchar *command = NULL;
 
 	/* get the data */
+#if defined(__sun) && defined(__SVR4)
+	command = g_strdup_printf ("pfexec " SBINDIR "/mate-power-backlight-helper --%s %i", argument, value);
+#else
 	command = g_strdup_printf ("pkexec " SBINDIR "/mate-power-backlight-helper --%s %i", argument, value);
+#endif
 	ret = g_spawn_command_line_sync (command, NULL, NULL, &exit_status, &error);
 	if (!ret) {
 		egg_error ("failed to get value: %s", error->message);