diff --git a/common/hw-gfx-gma-pipe_setup.adb b/common/hw-gfx-gma-pipe_setup.adb
index f49d6c0..f915a52 100644
--- a/common/hw-gfx-gma-pipe_setup.adb
+++ b/common/hw-gfx-gma-pipe_setup.adb
@@ -54,6 +54,8 @@
 
    PLANE_CTL_PLANE_ENABLE              : constant := 1 * 2 ** 31;
    PLANE_CTL_SRC_PIX_FMT_RGB_32B_8888  : constant := 4 * 2 ** 24;
+   PLANE_CTL_KEY_ENABLE_MASK           : constant := 3 * 2 ** 21;
+   PLANE_CTL_KEY_ENABLE_SOURCE         : constant := 1 * 2 ** 21;
    PLANE_CTL_PLANE_GAMMA_DISABLE       : constant := 1 * 2 ** 13;
    PLANE_CTL_TILED_SURFACE_MASK        : constant := 7 * 2 ** 10;
    PLANE_CTL_TILED_SURFACE_LINEAR      : constant := 0 * 2 ** 10;
@@ -62,6 +64,7 @@
    PLANE_CTL_TILED_SURFACE_YF_TILED    : constant := 5 * 2 ** 10;
    PLANE_CTL_ALPHA_MODE_MASK           : constant := 3 * 2 **  4;
    PLANE_CTL_ALPHA_MODE_SW_PREMULTIPLY : constant := 2 * 2 **  4;
+   PLANE_CTL_ALPHA_MODE_HW_PREMULTIPLY : constant := 3 * 2 **  4;
 
    PLANE_CTL_TILED_SURFACE : constant array (Tiling_Type) of Word32 :=
      (Linear   => PLANE_CTL_TILED_SURFACE_LINEAR,
@@ -529,6 +532,13 @@
       Controller : Controller_Type renames Controllers (Pipe);
    begin
       if Use_Plane_For_Cursor (FB) then
+         -- Use feffff (most white cyan) as key color for transparency.
+         -- It turned out that at least on APL, even fully transparent
+         -- pixels are faintly visible when blended onto the primary
+         -- framebuffer.
+         Registers.Write (Controller.PLANE_2_KEYVAL, 16#00_fe_ff_ff#);
+         Registers.Write (Controller.PLANE_2_KEYMSK, 16#07_ff_ff_ff#);
+
          if Config.Has_Plane_Color_Control then
             Registers.Write
               (Register => Controller.PLANE_2_COLOR_CTL,
@@ -659,9 +669,10 @@
 
                Registers.Write
                  (Register    => Controller.PLANE_2_CTL,
-                  Value       => PLANE_CTL_PLANE_ENABLE or
-                                 PLANE_CTL_SRC_PIX_FMT_RGB_32B_8888 or
-                                 PLANE_CTL_TILED_SURFACE (FB.Tiling) or
+                  Value       => PLANE_CTL_PLANE_ENABLE                 or
+                                 PLANE_CTL_SRC_PIX_FMT_RGB_32B_8888     or
+                                 PLANE_CTL_KEY_ENABLE_SOURCE            or
+                                 PLANE_CTL_TILED_SURFACE (FB.Tiling)    or
                                  PLANE_CTL_PLANE_ROTATION (FB.Rotation) or
                                 (if not Config.Has_Plane_Color_Control
                                  then PLANE_CTL_PLANE_GAMMA_DISABLE or
diff --git a/common/hw-gfx-gma-pipe_setup.ads b/common/hw-gfx-gma-pipe_setup.ads
index 3ba0ec4..40a8cee 100644
--- a/common/hw-gfx-gma-pipe_setup.ads
+++ b/common/hw-gfx-gma-pipe_setup.ads
@@ -91,6 +91,8 @@
          DSPPOS            : Registers.Registers_Index;
          -- Skylake registers (partially aliased)
          PLANE_CTL         : Registers.Registers_Index;
+         PLANE_KEYVAL      : Registers.Registers_Index;
+         PLANE_KEYMSK      : Registers.Registers_Index;
          PLANE_OFFSET      : Registers.Registers_Index;
          PLANE_POS         : Registers.Registers_Index;
          PLANE_SIZE        : Registers.Registers_Index;
@@ -106,6 +108,8 @@
          PLANE_COLOR_CTL   : Registers.Registers_Index;
          PLANE_WM          : PLANE_WM_Type;
          PLANE_2_CTL       : Registers.Registers_Index;
+         PLANE_2_KEYVAL    : Registers.Registers_Index;
+         PLANE_2_KEYMSK    : Registers.Registers_Index;
          PLANE_2_OFFSET    : Registers.Registers_Index;
          PLANE_2_POS       : Registers.Registers_Index;
          PLANE_2_SIZE      : Registers.Registers_Index;
@@ -158,6 +162,8 @@
            (if Config.Planes_Pipes_Swapped
             then Registers.PLANE_POS_1_B else Registers.PLANE_POS_1_A),
          PLANE_CTL         => Registers.DSPACNTR,
+         PLANE_KEYVAL      => Registers.PLANE_KEYVAL_1_A,
+         PLANE_KEYMSK      => Registers.PLANE_KEYMSK_1_A,
          PLANE_OFFSET      => Registers.DSPATILEOFF,
          PLANE_POS         => Registers.PLANE_POS_1_A,
          PLANE_SIZE        => Registers.PLANE_SIZE_1_A,
@@ -181,6 +187,8 @@
                               Registers.PLANE_WM_1_A_6,
                               Registers.PLANE_WM_1_A_7),
          PLANE_2_CTL       => Registers.PLANE_CTL_2_A,
+         PLANE_2_KEYVAL    => Registers.PLANE_KEYVAL_2_A,
+         PLANE_2_KEYMSK    => Registers.PLANE_KEYMSK_2_A,
          PLANE_2_OFFSET    => Registers.PLANE_OFFSET_2_A,
          PLANE_2_POS       => Registers.PLANE_POS_2_A,
          PLANE_2_SIZE      => Registers.PLANE_SIZE_2_A,
@@ -239,6 +247,8 @@
            (if Config.Planes_Pipes_Swapped
             then Registers.PLANE_POS_1_A else Registers.PLANE_POS_1_B),
          PLANE_CTL         => Registers.DSPBCNTR,
+         PLANE_KEYVAL      => Registers.PLANE_KEYVAL_1_B,
+         PLANE_KEYMSK      => Registers.PLANE_KEYMSK_1_B,
          PLANE_OFFSET      => Registers.DSPBTILEOFF,
          PLANE_POS         => Registers.PLANE_POS_1_B,
          PLANE_SIZE        => Registers.PLANE_SIZE_1_B,
@@ -262,6 +272,8 @@
                               Registers.PLANE_WM_1_B_6,
                               Registers.PLANE_WM_1_B_7),
          PLANE_2_CTL       => Registers.PLANE_CTL_2_B,
+         PLANE_2_KEYVAL    => Registers.PLANE_KEYVAL_2_B,
+         PLANE_2_KEYMSK    => Registers.PLANE_KEYMSK_2_B,
          PLANE_2_OFFSET    => Registers.PLANE_OFFSET_2_B,
          PLANE_2_POS       => Registers.PLANE_POS_2_B,
          PLANE_2_SIZE      => Registers.PLANE_SIZE_2_B,
@@ -306,6 +318,8 @@
          DSPSIZE           => Registers.PLANE_SIZE_1_C,
          DSPPOS            => Registers.PLANE_POS_1_C,
          PLANE_CTL         => Registers.DSPCCNTR,
+         PLANE_KEYVAL      => Registers.PLANE_KEYVAL_1_C,
+         PLANE_KEYMSK      => Registers.PLANE_KEYMSK_1_C,
          PLANE_OFFSET      => Registers.DSPCTILEOFF,
          PLANE_POS         => Registers.PLANE_POS_1_C,
          PLANE_SIZE        => Registers.PLANE_SIZE_1_C,
@@ -329,6 +343,8 @@
                               Registers.PLANE_WM_1_C_6,
                               Registers.PLANE_WM_1_C_7),
          PLANE_2_CTL       => Registers.PLANE_CTL_2_C,
+         PLANE_2_KEYVAL    => Registers.PLANE_KEYVAL_2_C,
+         PLANE_2_KEYMSK    => Registers.PLANE_KEYMSK_2_C,
          PLANE_2_OFFSET    => Registers.PLANE_OFFSET_2_C,
          PLANE_2_POS       => Registers.PLANE_POS_2_C,
          PLANE_2_SIZE      => Registers.PLANE_SIZE_2_C,
diff --git a/common/hw-gfx-gma-registers.ads b/common/hw-gfx-gma-registers.ads
index 025c5b5..02e7520 100644
--- a/common/hw-gfx-gma-registers.ads
+++ b/common/hw-gfx-gma-registers.ads
@@ -583,6 +583,8 @@
       DSPASTRIDE,
       PLANE_POS_1_A,
       PLANE_SIZE_1_A,
+      PLANE_KEYVAL_1_A,
+      PLANE_KEYMSK_1_A,
       DSPASURF,
       DSPATILEOFF,
       PLANE_AUX_DIST_1_A,
@@ -600,6 +602,8 @@
       PLANE_STRIDE_2_A,
       PLANE_POS_2_A,
       PLANE_SIZE_2_A,
+      PLANE_KEYVAL_2_A,
+      PLANE_KEYMSK_2_A,
       PLANE_SURF_2_A,
       PLANE_OFFSET_2_A,
       PLANE_COLOR_CTL_2_A,
@@ -641,6 +645,8 @@
       DSPBSTRIDE,
       PLANE_POS_1_B,
       PLANE_SIZE_1_B,
+      PLANE_KEYVAL_1_B,
+      PLANE_KEYMSK_1_B,
       DSPBSURF,
       DSPBTILEOFF,
       PLANE_AUX_DIST_1_B,
@@ -658,6 +664,8 @@
       PLANE_STRIDE_2_B,
       PLANE_POS_2_B,
       PLANE_SIZE_2_B,
+      PLANE_KEYVAL_2_B,
+      PLANE_KEYMSK_2_B,
       PLANE_SURF_2_B,
       PLANE_OFFSET_2_B,
       PLANE_COLOR_CTL_2_B,
@@ -696,6 +704,8 @@
       DSPCSTRIDE,
       PLANE_POS_1_C,
       PLANE_SIZE_1_C,
+      PLANE_KEYVAL_1_C,
+      PLANE_KEYMSK_1_C,
       DSPCSURF,
       DSPCTILEOFF,
       PLANE_AUX_DIST_1_C,
@@ -713,6 +723,8 @@
       PLANE_STRIDE_2_C,
       PLANE_POS_2_C,
       PLANE_SIZE_2_C,
+      PLANE_KEYVAL_2_C,
+      PLANE_KEYMSK_2_C,
       PLANE_SURF_2_C,
       PLANE_OFFSET_2_C,
       PLANE_COLOR_CTL_2_C,
@@ -1152,6 +1164,8 @@
       DSPASTRIDE            => 16#07_0188# / Register_Width,
       PLANE_POS_1_A         => 16#07_018c# / Register_Width,
       PLANE_SIZE_1_A        => 16#07_0190# / Register_Width,
+      PLANE_KEYVAL_1_A      => 16#07_0194# / Register_Width,
+      PLANE_KEYMSK_1_A      => 16#07_0198# / Register_Width,
       DSPASURF              => 16#07_019c# / Register_Width,
       DSPATILEOFF           => 16#07_01a4# / Register_Width,
 
@@ -1160,6 +1174,8 @@
       PLANE_STRIDE_2_A      => 16#07_0288# / Register_Width,
       PLANE_POS_2_A         => 16#07_028c# / Register_Width,
       PLANE_SIZE_2_A        => 16#07_0290# / Register_Width,
+      PLANE_KEYVAL_2_A      => 16#07_0294# / Register_Width,
+      PLANE_KEYMSK_2_A      => 16#07_0298# / Register_Width,
       PLANE_SURF_2_A        => 16#07_029c# / Register_Width,
       PLANE_OFFSET_2_A      => 16#07_02a4# / Register_Width,
 
@@ -1280,6 +1296,8 @@
       DSPBSTRIDE            => 16#07_1188# / Register_Width,
       PLANE_POS_1_B         => 16#07_118c# / Register_Width,
       PLANE_SIZE_1_B        => 16#07_1190# / Register_Width,
+      PLANE_KEYVAL_1_B      => 16#07_1194# / Register_Width,
+      PLANE_KEYMSK_1_B      => 16#07_1198# / Register_Width,
       DSPBSURF              => 16#07_119c# / Register_Width,
       DSPBTILEOFF           => 16#07_11a4# / Register_Width,
 
@@ -1289,6 +1307,8 @@
       PLANE_POS_2_B         => 16#07_128c# / Register_Width,
       PLANE_SIZE_2_B        => 16#07_1290# / Register_Width,
       PLANE_SURF_2_B        => 16#07_129c# / Register_Width,
+      PLANE_KEYVAL_2_B      => 16#07_1294# / Register_Width,
+      PLANE_KEYMSK_2_B      => 16#07_1298# / Register_Width,
       PLANE_OFFSET_2_B      => 16#07_12a4# / Register_Width,
 
       -- FDI and PCH transcoder control
@@ -1388,6 +1408,8 @@
       DSPCSTRIDE            => 16#07_2188# / Register_Width,
       PLANE_POS_1_C         => 16#07_218c# / Register_Width,
       PLANE_SIZE_1_C        => 16#07_2190# / Register_Width,
+      PLANE_KEYVAL_1_C      => 16#07_2194# / Register_Width,
+      PLANE_KEYMSK_1_C      => 16#07_2198# / Register_Width,
       DSPCSURF              => 16#07_219c# / Register_Width,
       DSPCTILEOFF           => 16#07_21a4# / Register_Width,
 
@@ -1396,6 +1418,8 @@
       PLANE_STRIDE_2_C      => 16#07_2288# / Register_Width,
       PLANE_POS_2_C         => 16#07_228c# / Register_Width,
       PLANE_SIZE_2_C        => 16#07_2290# / Register_Width,
+      PLANE_KEYVAL_2_C      => 16#07_2294# / Register_Width,
+      PLANE_KEYMSK_2_C      => 16#07_2298# / Register_Width,
       PLANE_SURF_2_C        => 16#07_229c# / Register_Width,
       PLANE_OFFSET_2_C      => 16#07_22a4# / Register_Width,