Added lock screen keybind

binds/system/system.lua

@@ -11,5 +11,28 @@ return gears.table.join(
 			description = "Shutdown",
 			group = "System"
 		}
+	),
+
+	awful.key( {"Mod4"}, "a",
+		function ()
+			bin.system.lock()
+		end,
+
+		{
+			description = "Lock screen",
+			group = "System"
+		}
+	),
+
+	awful.key( {"Mod4", "Control"}, "x",
+		function ()
+			-- requires sudoers rule
+			awful.spawn("sudo systemctl restart lightdm")
+		end,
+
+		{
+			description = "Restart lightdm",
+			group = "System"
+		}
 	)
 )