diff --git a/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb b/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb
index 0fc4ad9..fa62a98 100644
--- a/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb
+++ b/common/haswell_shared/hw-gfx-gma-connectors-ddi.adb
@@ -747,4 +747,18 @@
       end if;
    end Off;
 
+   ----------------------------------------------------------------------------
+
+   procedure Post_Reset_Off
+   is
+      Clocks_Off : Word32 := 0;
+   begin
+      if not Config.Has_Per_DDI_Clock_Sel and not Config.Has_DDI_PHYs then
+         for Port in Digital_Port loop
+            Clocks_Off := Clocks_Off or DPLL_CTRL2_DDIx_CLOCK_OFF (Port);
+         end loop;
+         Registers.Set_Mask (Registers.DPLL_CTRL2, Clocks_Off);
+      end if;
+   end Post_Reset_Off;
+
 end HW.GFX.GMA.Connectors.DDI;
diff --git a/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads b/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads
index 4ccd995..ec1fce2 100644
--- a/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads
+++ b/common/haswell_shared/hw-gfx-gma-connectors-ddi.ads
@@ -28,6 +28,8 @@
 
    procedure Off (Port : Digital_Port);
 
+   procedure Post_Reset_Off;
+
 private
    type Buf_Trans_Range is range 0 .. 19;
    type Buf_Trans_Array is array (Buf_Trans_Range) of Word32;
diff --git a/common/haswell_shared/hw-gfx-gma-connectors.adb b/common/haswell_shared/hw-gfx-gma-connectors.adb
index f5e2e01..eb080e8 100644
--- a/common/haswell_shared/hw-gfx-gma-connectors.adb
+++ b/common/haswell_shared/hw-gfx-gma-connectors.adb
@@ -21,6 +21,12 @@
 
 package body HW.GFX.GMA.Connectors is
 
+   procedure Post_Reset_Off
+   is
+   begin
+      DDI.Post_Reset_Off;
+   end Post_Reset_Off;
+
    procedure Initialize
    is
    begin