+=item 8.
+
+(Linux/Unix guests) Is getty attached to the serial port?
+
+On some operating systems, system daemons will attach themselves to
+serial ports. Under Linux you can use the lsof command to check:
+
+ /usr/sbin/lsof | grep ttyS
+
+=item 9.
+
+(Linux/Unix guests) Is serial device not in raw mode?
+
+Client software should set the serial device to raw mode and
+disable echoing. The usual way to do this is:
+
+ stty raw -echo < /dev/ttyS1
+