--- linux-3.1-orig/drivers/rtc/rtc-cmos.c	2011-10-24 09:10:05.000000000 +0200
+++ linux-3.1/drivers/rtc/rtc-cmos.c	2011-11-08 17:43:29.000000000 +0100
@@ -164,7 +164,7 @@ static inline unsigned char cmos_read_ba
 static inline void cmos_write_bank2(unsigned char val, unsigned char addr)
 {
 	outb(addr, RTC_PORT(2));
-	outb(val, RTC_PORT(2));
+	outb(val, RTC_PORT(3));
 }
 
 #else