Add power management from xfce.

i3_config

@@ -30,6 +30,9 @@ exec --no-startup-id xss-lock --transfer-sleep-lock -- i3lock --nofork
 # and nm-applet is a desktop environment-independent system tray GUI for it.
 exec --no-startup-id nm-applet
 
+# Start Power Management at Startup
+exec_always --no-startup-id xfce4-power-manager
+
 # Use pactl to adjust volume in PulseAudio.
 set $refresh_i3status killall -SIGUSR1 i3status
 bindsym XF86AudioRaiseVolume exec --no-startup-id pactl set-sink-volume @DEFAULT_SINK@ +10% && $refresh_i3status
@@ -212,4 +215,4 @@ bar {
 }
 
 # set wallpaper
-#exec –no-startup-id ~/.fehbg
+#exec –no-startup-id ~/.fehbg