diff --git a/sys/dev/drm2/drm_edid.c b/sys/dev/drm2/drm_edid.c
index 38209ac..86306b9 100644
--- a/sys/dev/drm2/drm_edid.c
+++ b/sys/dev/drm2/drm_edid.c
@@ -266,17 +266,17 @@ drm_do_probe_ddc_edid(device_t adapter, unsigned char *buf,
 	do {
 		struct iic_msg msgs[] = {
 			{
-				.slave  = DDC_SEGMENT_ADDR,
+				.slave  = DDC_SEGMENT_ADDR << 1,
 				.flags  = 0,
 				.len    = 1,
 				.buf    = &segment,
 			}, {
-				.slave	= DDC_ADDR,
+				.slave	= DDC_ADDR << 1,
 				.flags	= IIC_M_WR,
 				.len	= 1,
 				.buf	= &start,
 			}, {
-				.slave	= DDC_ADDR,
+				.slave	= DDC_ADDR << 1,
 				.flags	= IIC_M_RD,
 				.len	= len,
 				.buf	= buf,
diff --git a/sys/dev/drm2/i915/intel_iic.c b/sys/dev/drm2/i915/intel_iic.c
index 40e6eca..dcda5f1 100644
--- a/sys/dev/drm2/i915/intel_iic.c
+++ b/sys/dev/drm2/i915/intel_iic.c
@@ -397,17 +397,11 @@ intel_iic_quirk_xfer(device_t idev, struct iic_msg *msgs, int nmsgs)
 	IICBB_SETSCL(bridge_dev, 1);
 	DELAY(I2C_RISEFALL_TIME);
 
-	/* convert slave addresses to format expected by iicbb */
-	for (i = 0; i < nmsgs; i++) {
-		msgs[i].slave <<= 1;
+	for (i = 0; i < nmsgs - 1; i++) {
 		/* force use of repeated start instead of default stop+start */
-		if (i != (nmsgs - 1))
-			 msgs[i].flags |= IIC_M_NOSTOP;
+		msgs[i].flags |= IIC_M_NOSTOP;
 	}
 	ret = iicbus_transfer(idev, msgs, nmsgs);
-	/* restore the addresses */
-	for (i = 0; i < nmsgs; i++)
-		msgs[i].slave >>= 1;
 	IICBB_SETSDA(bridge_dev, 1);
 	IICBB_SETSCL(bridge_dev, 1);
 	intel_iic_quirk_set(dev_priv, false);
diff --git a/sys/dev/drm2/i915/intel_modes.c b/sys/dev/drm2/i915/intel_modes.c
index 8bf1d59..22969d3 100644
--- a/sys/dev/drm2/i915/intel_modes.c
+++ b/sys/dev/drm2/i915/intel_modes.c
@@ -45,13 +45,13 @@ bool intel_ddc_probe(struct intel_encoder *intel_encoder, int ddc_bus)
 	u8 buf[2];
 	struct iic_msg msgs[] = {
 		{
-			.slave = DDC_ADDR,
+			.slave = DDC_ADDR << 1,
 			.flags = IIC_M_WR,
 			.len = 1,
 			.buf = out_buf,
 		},
 		{
-			.slave = DDC_ADDR,
+			.slave = DDC_ADDR << 1,
 			.flags = IIC_M_RD,
 			.len = 1,
 			.buf = buf,
diff --git a/sys/dev/drm2/i915/intel_sdvo.c b/sys/dev/drm2/i915/intel_sdvo.c
index 4b44134..8cae766 100644
--- a/sys/dev/drm2/i915/intel_sdvo.c
+++ b/sys/dev/drm2/i915/intel_sdvo.c
@@ -266,13 +266,13 @@ static bool intel_sdvo_read_byte(struct intel_sdvo *intel_sdvo, u8 addr, u8 *ch)
 {
 	struct iic_msg msgs[] = {
 		{
-			.slave = intel_sdvo->slave_addr,
+			.slave = intel_sdvo->slave_addr << 1,
 			.flags = 0,
 			.len = 1,
 			.buf = &addr,
 		},
 		{
-			.slave = intel_sdvo->slave_addr,
+			.slave = intel_sdvo->slave_addr << 1,
 			.flags = IIC_M_RD,
 			.len = 1,
 			.buf = ch,
@@ -454,14 +454,14 @@ intel_sdvo_write_cmd(struct intel_sdvo *intel_sdvo, u8 cmd, const void *args,
 	intel_sdvo_debug_write(intel_sdvo, cmd, args, args_len);
 
 	for (i = 0; i < args_len; i++) {
-		msgs[i].slave = intel_sdvo->slave_addr;
+		msgs[i].slave = intel_sdvo->slave_addr << 1;
 		msgs[i].flags = 0;
 		msgs[i].len = 2;
 		msgs[i].buf = buf + 2 *i;
 		buf[2*i + 0] = SDVO_I2C_ARG_0 - i;
 		buf[2*i + 1] = ((const u8*)args)[i];
 	}
-	msgs[i].slave = intel_sdvo->slave_addr;
+	msgs[i].slave = intel_sdvo->slave_addr << 1;
 	msgs[i].flags = 0;
 	msgs[i].len = 2;
 	msgs[i].buf = buf + 2*i;
@@ -470,12 +470,12 @@ intel_sdvo_write_cmd(struct intel_sdvo *intel_sdvo, u8 cmd, const void *args,
 
 	/* the following two are to read the response */
 	status = SDVO_I2C_CMD_STATUS;
-	msgs[i+1].slave = intel_sdvo->slave_addr;
+	msgs[i+1].slave = intel_sdvo->slave_addr << 1;
 	msgs[i+1].flags = 0;
 	msgs[i+1].len = 1;
 	msgs[i+1].buf = &status;
 
-	msgs[i+2].slave = intel_sdvo->slave_addr;
+	msgs[i+2].slave = intel_sdvo->slave_addr << 1;
 	msgs[i+2].flags = IIC_M_RD;
 	msgs[i+2].len = 1;
 	msgs[i+2].buf = &status;