Index: sys/dev/mii/atphy.c
===================================================================
--- sys/dev/mii/atphy.c	(revision 221350)
+++ sys/dev/mii/atphy.c	(working copy)
@@ -384,6 +384,7 @@
 static int
 atphy_setmedia(struct mii_softc *sc, int media)
 {
+	struct atphy_softc *asc;
 	uint16_t anar;
 
 	anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) | ANAR_CSMA;
@@ -396,6 +397,11 @@
 	     (EXTSR_1000TFDX | EXTSR_1000THDX)) != 0)
 		PHY_WRITE(sc, MII_100T2CR, GTCR_ADV_1000TFDX |
 		    GTCR_ADV_1000THDX);
+	else {
+		asc = (struct atphy_softc *)sc;
+		if (asc->mii_model == MII_MODEL_ATHEROS_F1)
+			PHY_WRITE(sc, MII_100T2CR, 0);
+	}
 	PHY_WRITE(sc, MII_BMCR, BMCR_RESET | BMCR_AUTOEN | BMCR_STARTNEG);
 
 	return (EJUSTRETURN);