diff --git a/TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8107_UnlitShadowMatteAmbientOcclusion.unity.meta b/TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8107_UnlitShadowMatteAmbientOcclusion.unity.meta
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diff --git a/TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8108_UnlitShadowMatteAmbientOcclusionMSAA.unity b/TestProjects/HDRP_Tests/Assets/GraphicTests/Scenes/8x_ShaderGraph/8108_UnlitShadowMatteAmbientOcclusionMSAA.unity
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diff --git a/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset b/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset
index 48ab39900e9..533e2de4e95 100644
--- a/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset
+++ b/TestProjects/HDRP_Tests/ProjectSettings/EditorBuildSettings.asset
@@ -179,6 +179,9 @@ EditorBuildSettings:
   - enabled: 1
     path: Assets/GraphicTests/Scenes/1x_Materials/1712_DecalAngleFading.unity
     guid: 4b93985ba01d5aa49a5f0cdd342faa27
+  - enabled: 1
+    path: Assets/GraphicTests/Scenes/1x_Materials/1713_MeshDecalViewBias.unity
+    guid: 0adc2fcc221085f45ba4dce7e4afae0d
   - enabled: 1
     path: Assets/GraphicTests/Scenes/1x_Materials/1800_Classification.unity
     guid: 5043daebf48d1b740bb244b9a55508ef
@@ -565,6 +568,9 @@ EditorBuildSettings:
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   - enabled: 1
     path: Assets/GraphicTests/Scenes/8x_ShaderGraph/8107_UnlitShadowMatteAmbientOcclusion.unity
+    guid: 3258eb67f3c2f974bb87d063ef60ccb5
+  - enabled: 1
+    path: Assets/GraphicTests/Scenes/8x_ShaderGraph/8108_UnlitShadowMatteAmbientOcclusionMSAA.unity
     guid: c2efdf3fe2a75b54588a53fc3be2bd17
   - enabled: 1
     path: Assets/GraphicTests/Scenes/8x_ShaderGraph/8201_VertexAnimation.unity
@@ -686,7 +692,4 @@ EditorBuildSettings:
   - enabled: 1
     path: Assets/GraphicTests/Scenes/9x_Other/9901_AOV_buffers.unity
     guid: 5b7d40e46ea038446bf4f714c9d89eaf
-  - enabled: 1
-    path: Assets/GraphicTests/Scenes/1x_Materials/1713_MeshDecalViewBias.unity
-    guid: 0adc2fcc221085f45ba4dce7e4afae0d
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diff --git a/com.unity.render-pipelines.high-definition/CHANGELOG.md b/com.unity.render-pipelines.high-definition/CHANGELOG.md
index e4c1fbef6aa..3e203bd6b63 100644
--- a/com.unity.render-pipelines.high-definition/CHANGELOG.md
+++ b/com.unity.render-pipelines.high-definition/CHANGELOG.md
@@ -26,6 +26,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - Fixed a reload bug when using objects from the scene in the lookdev (case 1300916).
 - Fixed light gizmo showing shadow near plane when shadows are disabled.
 - Fixed path tracing alpha channel support (case 1304187).
+- Fixed shadow matte not working with ambient occlusion when MSAA is enabled
 
 ### Changed
 - Change the source value for the ray tracing frame index iterator from m_FrameCount to the camera frame count (case 1301356).
diff --git a/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDShaderPasses.cs b/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDShaderPasses.cs
index a2ab4acf30f..8d4bfbf6cda 100644
--- a/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDShaderPasses.cs
+++ b/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDShaderPasses.cs
@@ -270,18 +270,6 @@ public static PassDescriptor GenerateDepthForwardOnlyPass(bool supportLighting)
             RenderStateCollection GenerateRenderState()
             {
                 var renderState = new RenderStateCollection { CoreRenderStates.DepthOnly };
-
-                if (!supportLighting)
-                {
-                    // Caution: When using MSAA we have normal and depth buffer bind.
-                    // Unlit objects need to NOT write in normal buffer (or write 0) - Disable color mask for this RT
-                    // Note: ShaderLab doesn't allow to have a variable on the second parameter of ColorMask
-                    // - When MSAA: disable target 1 (normal buffer)
-                    // - When no MSAA: disable target 0 (normal buffer) and 1 (unused)
-                    renderState.Add(RenderState.ColorMask("ColorMask [_ColorMaskNormal]"));
-                    renderState.Add(RenderState.ColorMask("ColorMask 0 1"));
-                }
-
                 return renderState;
             }
 
@@ -348,11 +336,14 @@ public static PassDescriptor GenerateMotionVectors(bool supportLighting, bool su
             DefineCollection GenerateDefines()
             {
                 if (!supportLighting)
-                    return null;
+                {
+                    // For shadow matte (unlit SG only) we need to enable write normal buffer
+                    return CoreDefines.MotionVectorUnlit;
+                }
 
                 var defines = new DefineCollection { Defines.raytracingDefault };
 
-                //  #define WRITE_NORMAL_BUFFER for motion vector in forward case
+                // TODO: do a #define WRITE_NORMAL_BUFFER for motion vector in forward only material case instead of a multi-compile
                 // if (supportForward)
                 // {
                 //     defines.Add(CoreKeywordDescriptors.WriteNormalBuffer, 1);
@@ -365,18 +356,6 @@ RenderStateCollection GenerateRenderState()
             {
                 var renderState = new RenderStateCollection();
                 renderState.Add(CoreRenderStates.MotionVectors);
-
-                if (!supportLighting)
-                {
-                    // Caution: When using MSAA we have motion vector, normal and depth buffer bind.
-                    // Unlit objects need to NOT write in normal buffer (or write 0) - Disable color mask for this RT
-                    // Note: ShaderLab doesn't allow to have a variable on the second parameter of ColorMask
-                    // - When MSAA: disable target 2 (normal buffer)
-                    // - When no MSAA: disable target 1 (normal buffer) and 2 (unused)
-                    renderState.Add(RenderState.ColorMask("ColorMask [_ColorMaskNormal] 1"));
-                    renderState.Add(RenderState.ColorMask("ColorMask 0 2"));
-                }
-
                 return renderState;
             }
 
@@ -581,17 +560,6 @@ RenderStateCollection GenerateRenderState()
                     }) },
                 };
 
-                if (!supportLighting)
-                {
-                    // Caution: When using MSAA we have normal and depth buffer bind.
-                    // Unlit objects need to NOT write in normal buffer (or write 0) - Disable color mask for this RT
-                    // Note: ShaderLab doesn't allow to have a variable on the second parameter of ColorMask
-                    // - When MSAA: disable target 1 (normal buffer)
-                    // - When no MSAA: disable target 0 (normal buffer) and 1 (unused)
-                    renderState.Add(RenderState.ColorMask("ColorMask [_ColorMaskNormal]"));
-                    renderState.Add(RenderState.ColorMask("ColorMask 0 1"));
-                }
-
                 return renderState;
             }
 
diff --git a/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDTarget.cs b/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDTarget.cs
index 9837c1c5976..af7ac0a505f 100644
--- a/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDTarget.cs
+++ b/com.unity.render-pipelines.high-definition/Editor/Material/ShaderGraph/HDTarget.cs
@@ -823,6 +823,13 @@ static class CoreDefines
 
         public static DefineCollection DepthForwardOnlyUnlit = new DefineCollection
         {
+            // When using Shadow matte, we need to output a normal buffer even for unlit so it is compatible with ambient occlusion
+            { CoreKeywordDescriptors.WriteNormalBuffer, 1, new FieldCondition(HDUnlitSubTarget.EnableShadowMatte, true)},
+        };
+
+        public static DefineCollection MotionVectorUnlit = new DefineCollection
+        {
+            // When using Shadow matte, we need to output a normal buffer even for unlit so it is compatible with ambient occlusion
             { CoreKeywordDescriptors.WriteNormalBuffer, 1, new FieldCondition(HDUnlitSubTarget.EnableShadowMatte, true)},
         };
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/Material/Unlit/Unlit.shader b/com.unity.render-pipelines.high-definition/Runtime/Material/Unlit/Unlit.shader
index 64197367440..80cedfe1b5f 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/Material/Unlit/Unlit.shader
+++ b/com.unity.render-pipelines.high-definition/Runtime/Material/Unlit/Unlit.shader
@@ -198,14 +198,6 @@ Shader "HDRP/Unlit"
 
             ZWrite On
 
-            // Caution: When using MSAA we have normal and depth buffer bind.
-            // Unlit objects need to NOT write in normal buffer (or write 0) - Disable color mask for this RT
-            // Note: ShaderLab doesn't allow to have a variable on the second parameter of ColorMask
-            // - When MSAA: disable target 1 (normal buffer)
-            // - When no MSAA: disable target 0 (normal buffer) and 1 (unused)
-            ColorMask [_ColorMaskNormal]
-            ColorMask 0 1
-
             HLSLPROGRAM
 
             #pragma only_renderers d3d11 playstation xboxone vulkan metal switch
@@ -214,6 +206,7 @@ Shader "HDRP/Unlit"
             #pragma multi_compile _ DOTS_INSTANCING_ON
 
             #pragma multi_compile _ WRITE_MSAA_DEPTH
+            // Note: Only shader graph support Shadow Matte, so we do'nt need normal buffer here
             // Note we don't need to define WRITE_NORMAL_BUFFER
             // Note we don't need to define WRITE_DECAL_BUFFER
 
@@ -251,14 +244,6 @@ Shader "HDRP/Unlit"
 
             ZWrite On
 
-            // Caution: When using MSAA we have motion vector, normal and depth buffer bind.
-            // Unlit objects need to NOT write in normal buffer (or write 0) - Disable color mask for this RT
-            // Note: ShaderLab doesn't allow to have a variable on the second parameter of ColorMask
-            // - When MSAA: disable target 2 (normal buffer)
-            // - When no MSAA: disable target 1 (normal buffer) and 2 (unused)
-            ColorMask [_ColorMaskNormal] 1
-            ColorMask 0 2
-
             HLSLPROGRAM
 
             #pragma only_renderers d3d11 playstation xboxone vulkan metal switch
@@ -267,6 +252,7 @@ Shader "HDRP/Unlit"
             #pragma multi_compile _ DOTS_INSTANCING_ON
 
             #pragma multi_compile _ WRITE_MSAA_DEPTH
+            // Note: Only shader graph support Shadow Matte, so we do'nt need normal buffer here
             // Note we don't need to define WRITE_NORMAL_BUFFER
             // Note we don't need to define WRITE_DECAL_BUFFER
 
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.Prepass.cs b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.Prepass.cs
index 4bf62ccb967..9d69d22dcef 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.Prepass.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.Prepass.cs
@@ -448,9 +448,6 @@ void RenderObjectsMotionVectors(RenderGraph renderGraph, CullingResults cull, HD
                 builder.SetRenderFunc(
                     (ObjectMotionVectorsPassData data, RenderGraphContext context) =>
                     {
-                        // Disable write to normal buffer for unlit shader (the normal buffer binding change when using MSAA)
-                        context.cmd.SetGlobalInt(HDShaderIDs._ColorMaskNormal, data.frameSettings.IsEnabled(FrameSettingsField.MSAA) ? (int)ColorWriteMask.All : 0);
-
                         DrawOpaqueRendererList(context, data.frameSettings, data.rendererList);
                     });
             }
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs
index 2bd77935229..c84a74127cc 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDRenderPipeline.cs
@@ -2764,9 +2764,6 @@ static void RenderDepthPrepass(ScriptableRenderContext     renderContext,
             bool                        hasDepthDeferredPass
         )
         {
-            // Disable write to normal buffer for unlit shader (the normal buffer binding change when using MSAA)
-            cmd.SetGlobalInt(HDShaderIDs._ColorMaskNormal, frameSettings.IsEnabled(FrameSettingsField.MSAA) ? (int)ColorWriteMask.All : 0);
-
             if (hasDepthDeferredPass)
             {
                 if (deferredMrt == null)
diff --git a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs
index b72c059cd7a..1c410a5572d 100644
--- a/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs
+++ b/com.unity.render-pipelines.high-definition/Runtime/RenderPipeline/HDStringConstants.cs
@@ -220,7 +220,6 @@ static class HDShaderIDs
         public static readonly int _DstBlend = Shader.PropertyToID("_DstBlend");
 
         public static readonly int _ColorMaskTransparentVel = Shader.PropertyToID("_ColorMaskTransparentVel");
-        public static readonly int _ColorMaskNormal = Shader.PropertyToID("_ColorMaskNormal");
         public static readonly int _DecalColorMask0 = Shader.PropertyToID(HDMaterialProperties.kDecalColorMask0);
         public static readonly int _DecalColorMask1 = Shader.PropertyToID(HDMaterialProperties.kDecalColorMask1);
         public static readonly int _DecalColorMask2 = Shader.PropertyToID(HDMaterialProperties.kDecalColorMask2);