diff -u tp_smapi-0.40/thinkpad_ec.c.orig tp_smapi-0.40/thinkpad_ec.c
--- tp_smapi-0.40/thinkpad_ec.c.orig	2011-06-03 22:54:14.873403482 -0400
+++ tp_smapi-0.40/thinkpad_ec.c	2011-06-03 22:55:07.463950063 -0400
@@ -456,6 +456,12 @@
 		TP_DMI_MATCH("IBM", "ThinkPad A30"),
 		TP_DMI_MATCH("IBM", "ThinkPad T23"),
 		TP_DMI_MATCH("IBM", "ThinkPad X24"),
+		TP_DMI_MATCH("LENOVO", "ThinkPad T420"),
+		TP_DMI_MATCH("LENOVO", "ThinkPad T420s"),
+		TP_DMI_MATCH("LENOVO", "ThinkPad T520"),
+		TP_DMI_MATCH("LENOVO", "ThinkPad X220"),
+		TP_DMI_MATCH("LENOVO", "ThinkPad X220t"),
+		TP_DMI_MATCH("LENOVO", "ThinkPad W520"),
 		{ .ident = NULL }
 	};
 	return dmi_find_substring