diff --git a/common/ironlake/hw-gfx-gma-connectors.adb b/common/ironlake/hw-gfx-gma-connectors.adb
index 11ecdf6..d813fe4 100644
--- a/common/ironlake/hw-gfx-gma-connectors.adb
+++ b/common/ironlake/hw-gfx-gma-connectors.adb
@@ -14,6 +14,8 @@
 --
 
 with HW.GFX.GMA.Config;
+with HW.GFX.GMA.DP_Info;
+with HW.GFX.GMA.Registers;
 with HW.GFX.GMA.Panel;
 with HW.GFX.GMA.Connectors.EDP;
 with HW.GFX.GMA.Connectors.FDI;
@@ -39,8 +41,33 @@
       Port_Cfg : in out Port_Config;
       Success  :    out Boolean)
    is
+      -- Override lane count for FDI_B if FDI_C is used
+      procedure Override_FDI_Link
+      with
+         Post => Port_Cfg.Mode = Port_Cfg'Old.Mode
+      is
+         FDI_TX_CTL_FDI_TX_ENABLE : constant := 1 * 2 ** 31;
+         Enabled : Boolean;
+      begin
+         if Config.Has_FDI_C and then Port_Cfg.Port = DIGI_C then
+            -- if DIGI_D enabled: (FDI names are off by one)
+            Registers.Is_Set_Mask
+              (Register => Registers.FDI_TX_CTL_C,
+               Mask     => FDI_TX_CTL_FDI_TX_ENABLE,
+               Result   => Enabled);
+            if Enabled then
+               Port_Cfg.FDI.Receiver_Caps.Max_Lane_Count := DP_Lane_Count_2;
+            end if;
+         end if;
+
+         DP_Info.Preferred_Link_Setting (Port_Cfg.FDI, Port_Cfg.Mode, Success);
+      end Override_FDI_Link;
    begin
-      Success := True;
+      if Port_Cfg.Is_FDI then
+         Override_FDI_Link;
+      else
+         Success := True;
+      end if;
    end Prepare;
 
    ----------------------------------------------------------------------------