diff --git a/meta-witherspoon/recipes-phosphor/chassis/vcs-pre-post/vcs_on.sh b/meta-witherspoon/recipes-phosphor/chassis/vcs-pre-post/vcs_on.sh
index 4837575..3713662 100644
--- a/meta-witherspoon/recipes-phosphor/chassis/vcs-pre-post/vcs_on.sh
+++ b/meta-witherspoon/recipes-phosphor/chassis/vcs-pre-post/vcs_on.sh
@@ -9,3 +9,37 @@
 i2cset -y 5 0x70 0x00 0x01 b
 i2cset -y 5 0x70 0x02 0x1A b #respond to OPERATION
 i2cset -y 5 0x70 0x00 0x00 b
+
+# unbind ucd driver to permit i2cset
+ucd_retries=5
+ucd=
+
+ucdpath="/sys/bus/i2c/drivers/ucd9000"
+if [ -e $ucdpath ]
+then
+  ucd=`ls -1 $ucdpath | grep 64`
+  if [ -n "$ucd" ]
+  then
+    echo $ucd > $ucdpath/unbind
+  fi
+fi
+
+
+# re-enable VCS in system PGOOD
+sleep 1
+#SYSTEM_RESET_CONFIG
+i2cset -y 11 0x64 0xD2 0x09 0xFF 0xFF 0x27 0x0A 0x00 0x06 0x00 0x00 0x02 i
+
+# re-bind ucd driver only if we unbound it (i.e. ucd has been set with a value)
+if [ -e $ucdpath -a -n "$ucd" ]; then
+  j=0
+  until [ $j -ge $ucd_retries ] || [ -e $ucdpath/$ucd ]; do
+    j=$((j+1))
+    echo $ucd > $ucdpath/bind || ret=$?
+    if [ $j -gt 1 ]; then
+      echo "rebinding UCD driver. Retry number $j"
+      sleep 1
+    fi
+  done
+  if [ ! -e $ucdpath/$ucd ]; then exit $ret; fi
+fi