https://bugs.gentoo.org/538590

--- acpid-2.0.25/samples/powerbtn/powerbtn.sh
+++ acpid-2.0.25/samples/powerbtn/powerbtn.sh
@@ -51,7 +51,7 @@
 getXconsole
 
 # A list of power management system process names.
-PMS="gnome-power-manager kpowersave xfce4-power-manager"
+PMS="gnome-power-manager kpowersave xfce4-power-manager mate-power-manager"
 PMS="$PMS guidance-power-manager.py dalston-power-applet"
 
 # If one of those is running or any of several others,