diff -ruN /mnt/src/share/man/man4/re.4 share/man/man4/re.4
--- /mnt/src/share/man/man4/re.4	2011-01-12 16:14:28.000000000 +0300
+++ share/man/man4/re.4	2011-01-12 19:00:11.000000000 +0300
@@ -178,6 +178,26 @@
 .It Va hw.re.msi_disable
 This tunable disables MSI support on the Ethernet hardware.
 The default value is 0.
+.It Va dev.rgephy.%d.autoneg_can_be_disabled
+By default, rgephy, PHY used with supported Realtek controllers, always
+uses autonegotiation, even if
+.Cm media
+or
+.Cm mdeiaopt
+are specified by user. It is done to avoid bug in some PHY
+implementations. Sometimes you need to disable autonegotiation anywhere.
+This tunable, if set to non-zero value, enables to use manual media settings
+without autonegoteation at all. If 
+.Cm media
+is set as 
+.Cm autoselect
+autonegotiation will not depend on this tunable. This tunable is accessible
+as sysctl too, but affects only future using of 
+.Cm media
+and
+.Cm mediaopt
+options of
+.Xr ifconfig 8
 .El
 .Sh DIAGNOSTICS
 .Bl -diag
diff -ruN /mnt/src/sys/dev/mii/rgephy.c sys/dev/mii/rgephy.c
--- /mnt/src/sys/dev/mii/rgephy.c	2011-01-12 16:14:26.000000000 +0300
+++ sys/dev/mii/rgephy.c	2011-01-12 18:52:06.000000000 +0300
@@ -42,6 +42,7 @@
 #include <sys/kernel.h>
 #include <sys/module.h>
 #include <sys/socket.h>
+#include <sys/sysctl.h>
 #include <sys/bus.h>
 
 #include <net/if.h>
@@ -66,6 +67,7 @@
 	struct mii_softc mii_sc;
 	int mii_model;
 	int mii_revision;
+	int mii_autoneg_can_be_disabled;
 };
 
 static device_method_t rgephy_methods[] = {
@@ -113,6 +115,7 @@
 	struct mii_softc *sc;
 	struct mii_attach_args *ma;
 	struct mii_data *mii;
+	char tn[64];
 
 	rsc = device_get_softc(dev);
 	sc = &rsc->mii_sc;
@@ -129,6 +132,16 @@
 
 	rsc->mii_model = MII_MODEL(ma->mii_id2);
 	rsc->mii_revision = MII_REV(ma->mii_id2);
+	
+	rsc->mii_autoneg_can_be_disabled = 0;
+	snprintf(tn, sizeof(tn), "dev.%s.%d.autoneg_can_be_disabled",
+	    device_get_name(dev), device_get_unit(dev));
+	TUNABLE_INT_FETCH(tn, &rsc->mii_autoneg_can_be_disabled);
+	SYSCTL_ADD_INT(device_get_sysctl_ctx(dev),
+	    SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+	    OID_AUTO, "autoneg_can_be_disabled", CTLFLAG_RW,
+	    &rsc->mii_autoneg_can_be_disabled, 0,
+	    "Autonegation can be disabled on adapter");
 
 #define	ADD(m, c)	ifmedia_add(&mii->mii_media, (m), (c), NULL)
 
@@ -213,11 +226,12 @@
 			}
 
 			if (IFM_SUBTYPE(ife->ifm_media) != IFM_1000_T) {
+				if (!rsc->mii_autoneg_can_be_disabled)
+					speed |= RGEPHY_BMCR_AUTOEN |
+					    RGEPHY_BMCR_STARTNEG;
 				PHY_WRITE(sc, RGEPHY_MII_1000CTL, 0);
 				PHY_WRITE(sc, RGEPHY_MII_ANAR, anar);
-				PHY_WRITE(sc, RGEPHY_MII_BMCR, speed |
-				    RGEPHY_BMCR_AUTOEN |
-				    RGEPHY_BMCR_STARTNEG);
+				PHY_WRITE(sc, RGEPHY_MII_BMCR, speed);
 				break;
 			}