diff --git a/js/linux-power-management.js b/js/linux-power-management.js
index 6be4eb7..51aa79c 100644
--- a/js/linux-power-management.js
+++ b/js/linux-power-management.js
@@ -1,7 +1,21 @@
+/*
+   Copyright 2019-2022 Michael Pozhidaev <msp@luwrain.org>
 
+   This file is part of LUWRAIN.
+
+   LUWRAIN is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public
+   License as published by the Free Software Foundation; either
+   version 3 of the License, or (at your option) any later version.
+
+   LUWRAIN is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+*/
 
 Luwrain.addCommand("poweroff", ()=>{
-    Linux.runAsync("sudo systemctl poweroff");
+    Linux.runAsync("if [ -e /cdrom/casper/filesystem.squashfs ]; then sudo poweroff --force; else sudo systemctl poweroff; fi");
 });
 
 Luwrain.addCommand("reboot", ()=>{