diff -Naur linux-2.4.24.orig/drivers/char/serial.c linux-2.4.24/drivers/char/serial.c
--- linux-2.4.24.orig/drivers/char/serial.c	2003-11-29 03:26:20.000000000 +0900
+++ linux-2.4.24/drivers/char/serial.c	2004-01-10 07:50:23.000000000 +0900
@@ -3771,8 +3771,11 @@
 			serial_outp(info, UART_FCR,
 				    UART_FCR_ENABLE_FIFO | UART_FCR7_64BYTE);
 			scratch = serial_in(info, UART_IIR) >> 5;
+
+			/*
 			if (scratch == 6)
 				state->type = PORT_16750;
+			*/
 		}
 		serial_outp(info, UART_FCR, UART_FCR_ENABLE_FIFO);
 	}