diff --git a/[refs] b/[refs]
index 17032af454cd..facc2eb9d950 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a0483e2eb63d3b2f14a821edb21b3e610bfba5bd
+refs/heads/master: 3860a0bf748bf98a30f2bab73d5e3653583f7b47
diff --git a/trunk/drivers/net/ethernet/intel/igb/igb.h b/trunk/drivers/net/ethernet/intel/igb/igb.h
index c15a4811b476..17f1686ee411 100644
--- a/trunk/drivers/net/ethernet/intel/igb/igb.h
+++ b/trunk/drivers/net/ethernet/intel/igb/igb.h
@@ -42,6 +42,8 @@
 
 struct igb_adapter;
 
+#define E1000_PCS_CFG_IGN_SD               1
+
 /* Interrupt defines */
 #define IGB_START_ITR                    648 /* ~6000 ints/sec */
 #define IGB_4K_ITR                       980
diff --git a/trunk/drivers/net/ethernet/intel/igb/igb_ethtool.c b/trunk/drivers/net/ethernet/intel/igb/igb_ethtool.c
index e2288b5a9caa..bfe9208c4b18 100644
--- a/trunk/drivers/net/ethernet/intel/igb/igb_ethtool.c
+++ b/trunk/drivers/net/ethernet/intel/igb/igb_ethtool.c
@@ -1624,6 +1624,20 @@ static int igb_setup_loopback_test(struct igb_adapter *adapter)
 		reg &= ~E1000_CONNSW_ENRGSRC;
 		wr32(E1000_CONNSW, reg);
 
+		/* Unset sigdetect for SERDES loopback on
+		 * 82580 and i350 devices.
+		 */
+		switch (hw->mac.type) {
+		case e1000_82580:
+		case e1000_i350:
+			reg = rd32(E1000_PCS_CFG0);
+			reg |= E1000_PCS_CFG_IGN_SD;
+			wr32(E1000_PCS_CFG0, reg);
+			break;
+		default:
+			break;
+		}
+
 		/* Set PCS register for forced speed */
 		reg = rd32(E1000_PCS_LCTL);
 		reg &= ~E1000_PCS_LCTL_AN_ENABLE;     /* Disable Autoneg*/