--- rxtx-2.2pre2/src/gnu/io/RXTXCommDriver.java.orig
+++ rxtx-2.2pre2/src/gnu/io/RXTXCommDriver.java
@@ -574,6 +574,7 @@
 					if(osName.equals("Linux"))
 					{
 						String[] Temp = {
+						"ttyACM", // linux USB modems
 						"ttyS", // linux Serial Ports
 						"ttySA", // for the IPAQs
 						"ttyUSB", // for USB frobs