diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_connector.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_connector.c
index 154e1f35dcb1..dbd1e8429a4d 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_connector.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_connector.c
@@ -732,6 +732,24 @@ get_aspect_ratio(const struct drm_display_mode *mode_in)
 }
 EXPORT_IF_KUNIT(get_aspect_ratio);
 
+/*
+ * CTA-861 5.1: RGB video formats default to limited range except 640x480 (VIC 1).
+ * With Broadcast RGB left at Automatic follow that default, as i915 does.
+ */
+static bool rgb_output_is_limited_range(const struct dc_crtc_timing *dc_crtc_timing,
+					const struct drm_connector_state *connector_state)
+{
+	switch (connector_state->hdmi.broadcast_rgb) {
+	case DRM_HDMI_BROADCAST_RGB_FULL:
+		return false;
+	case DRM_HDMI_BROADCAST_RGB_LIMITED:
+		return true;
+	default:
+		return connector_state->connector->display_info.is_hdmi &&
+		       dc_crtc_timing->vic > 1;
+	}
+}
+
 enum dc_color_space
 amdgpu_dm_get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing,
 				 const struct drm_connector_state *connector_state)
@@ -757,7 +775,7 @@ amdgpu_dm_get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing,
 	case DRM_MODE_COLORIMETRY_BT2020_RGB:
 	case DRM_MODE_COLORIMETRY_BT2020_YCC:
 		if (dc_crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB) {
-			if (connector_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_LIMITED)
+			if (rgb_output_is_limited_range(dc_crtc_timing, connector_state))
 				color_space = COLOR_SPACE_2020_RGB_LIMITEDRANGE;
 			else
 				color_space = COLOR_SPACE_2020_RGB_FULLRANGE;
@@ -769,7 +787,7 @@ amdgpu_dm_get_output_color_space(const struct dc_crtc_timing *dc_crtc_timing,
 	default:
 		if (dc_crtc_timing->pixel_encoding == PIXEL_ENCODING_RGB) {
 			color_space = COLOR_SPACE_SRGB;
-			if (connector_state->hdmi.broadcast_rgb == DRM_HDMI_BROADCAST_RGB_LIMITED)
+			if (rgb_output_is_limited_range(dc_crtc_timing, connector_state))
 				color_space = COLOR_SPACE_SRGB_LIMITED;
 		/*
 		 * 27030khz is the separation point between HDTV and SDTV
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_connector_test.c b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_connector_test.c
index 212a7536e65b..59ce682f491b 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_connector_test.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/tests/amdgpu_dm_connector_test.c
@@ -409,7 +409,9 @@ static void dm_test_output_color_space_default_rgb_full(struct kunit *test)
 {
 	struct dc_crtc_timing timing = {};
 	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
 
+	state.connector = connector;
 	timing.pixel_encoding = PIXEL_ENCODING_RGB;
 	state.colorspace = DRM_MODE_COLORIMETRY_DEFAULT;
 	state.hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
@@ -559,7 +561,9 @@ static void dm_test_output_color_space_bt2020_rgb(struct kunit *test)
 {
 	struct dc_crtc_timing timing = {};
 	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
 
+	state.connector = connector;
 	timing.pixel_encoding = PIXEL_ENCODING_RGB;
 	state.colorspace = DRM_MODE_COLORIMETRY_BT2020_RGB;
 
@@ -584,6 +588,110 @@ static void dm_test_output_color_space_bt2020_rgb_limited(struct kunit *test)
 			(int)COLOR_SPACE_2020_RGB_LIMITEDRANGE);
 }
 
+/**
+ * dm_test_output_color_space_default_rgb_auto_hdmi_cta - Automatic follows the CTA-861 default
+ * @test: The KUnit test context
+ */
+static void dm_test_output_color_space_default_rgb_auto_hdmi_cta(struct kunit *test)
+{
+	struct dc_crtc_timing timing = {};
+	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
+
+	connector->display_info.is_hdmi = true;
+	timing.pixel_encoding = PIXEL_ENCODING_RGB;
+	timing.vic = 32;
+	state.connector = connector;
+	state.colorspace = DRM_MODE_COLORIMETRY_DEFAULT;
+	state.hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
+
+	KUNIT_EXPECT_EQ(test, (int)amdgpu_dm_get_output_color_space(&timing, &state),
+			(int)COLOR_SPACE_SRGB_LIMITED);
+}
+
+/**
+ * dm_test_output_color_space_default_rgb_auto_hdmi_vga - 640x480 (VIC 1) stays full range
+ * @test: The KUnit test context
+ */
+static void dm_test_output_color_space_default_rgb_auto_hdmi_vga(struct kunit *test)
+{
+	struct dc_crtc_timing timing = {};
+	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
+
+	connector->display_info.is_hdmi = true;
+	timing.pixel_encoding = PIXEL_ENCODING_RGB;
+	timing.vic = 1;
+	state.connector = connector;
+	state.colorspace = DRM_MODE_COLORIMETRY_DEFAULT;
+	state.hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
+
+	KUNIT_EXPECT_EQ(test, (int)amdgpu_dm_get_output_color_space(&timing, &state),
+			(int)COLOR_SPACE_SRGB);
+}
+
+/**
+ * dm_test_output_color_space_default_rgb_auto_dp_cta - Automatic on a non-HDMI sink is full range
+ * @test: The KUnit test context
+ */
+static void dm_test_output_color_space_default_rgb_auto_dp_cta(struct kunit *test)
+{
+	struct dc_crtc_timing timing = {};
+	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
+
+	timing.pixel_encoding = PIXEL_ENCODING_RGB;
+	timing.vic = 32;
+	state.connector = connector;
+	state.colorspace = DRM_MODE_COLORIMETRY_DEFAULT;
+	state.hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
+
+	KUNIT_EXPECT_EQ(test, (int)amdgpu_dm_get_output_color_space(&timing, &state),
+			(int)COLOR_SPACE_SRGB);
+}
+
+/**
+ * dm_test_output_color_space_default_rgb_full_hdmi_cta - Full overrides the CTA-861 default
+ * @test: The KUnit test context
+ */
+static void dm_test_output_color_space_default_rgb_full_hdmi_cta(struct kunit *test)
+{
+	struct dc_crtc_timing timing = {};
+	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
+
+	connector->display_info.is_hdmi = true;
+	timing.pixel_encoding = PIXEL_ENCODING_RGB;
+	timing.vic = 32;
+	state.connector = connector;
+	state.colorspace = DRM_MODE_COLORIMETRY_DEFAULT;
+	state.hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_FULL;
+
+	KUNIT_EXPECT_EQ(test, (int)amdgpu_dm_get_output_color_space(&timing, &state),
+			(int)COLOR_SPACE_SRGB);
+}
+
+/**
+ * dm_test_output_color_space_bt2020_rgb_auto_hdmi_cta - BT.2020 RGB follows the same default
+ * @test: The KUnit test context
+ */
+static void dm_test_output_color_space_bt2020_rgb_auto_hdmi_cta(struct kunit *test)
+{
+	struct dc_crtc_timing timing = {};
+	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
+
+	connector->display_info.is_hdmi = true;
+	timing.pixel_encoding = PIXEL_ENCODING_RGB;
+	timing.vic = 32;
+	state.connector = connector;
+	state.colorspace = DRM_MODE_COLORIMETRY_BT2020_RGB;
+	state.hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
+
+	KUNIT_EXPECT_EQ(test, (int)amdgpu_dm_get_output_color_space(&timing, &state),
+			(int)COLOR_SPACE_2020_RGB_LIMITEDRANGE);
+}
+
 /**
  * dm_test_output_color_space_bt2020_ycc - Test Output color space bt2020 ycc
  * @test: The KUnit test context
@@ -647,7 +755,9 @@ static void dm_test_output_color_space_bt2020_ycc_rgb_encoding(struct kunit *tes
 {
 	struct dc_crtc_timing timing = {};
 	struct drm_connector_state state = {};
+	struct drm_connector *connector = kunit_kzalloc(test, sizeof(*connector), GFP_KERNEL);
 
+	state.connector = connector;
 	timing.pixel_encoding = PIXEL_ENCODING_RGB;
 	state.colorspace = DRM_MODE_COLORIMETRY_BT2020_YCC;
 
@@ -3425,6 +3535,7 @@ static struct dm_test_fill_ctx *dm_test_fill_ctx_alloc(struct kunit *test)
 
 	ctx->conn_state = drmm_kzalloc(ctx->drm, sizeof(*ctx->conn_state), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, ctx->conn_state);
+	ctx->conn_state->connector = &ctx->aconnector->base;
 	ctx->stream = kunit_kzalloc(test, sizeof(*ctx->stream), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, ctx->stream);
 	ctx->mode = kunit_kzalloc(test, sizeof(*ctx->mode), GFP_KERNEL);
@@ -3818,6 +3929,7 @@ static struct dm_test_stream_ctx *dm_test_stream_ctx_alloc(struct kunit *test)
 
 	ctx->dm_state = kunit_kzalloc(test, sizeof(*ctx->dm_state), GFP_KERNEL);
 	KUNIT_ASSERT_NOT_NULL(test, ctx->dm_state);
+	ctx->dm_state->base.connector = &ctx->aconnector->base;
 	ctx->dm_state->scaling = RMX_OFF;
 
 	ctx->mode = kunit_kzalloc(test, sizeof(*ctx->mode), GFP_KERNEL);
@@ -5458,6 +5570,11 @@ static struct kunit_case amdgpu_dm_connector_tests[] = {
 	KUNIT_CASE(dm_test_output_color_space_oprgb),
 	KUNIT_CASE(dm_test_output_color_space_bt2020_rgb),
 	KUNIT_CASE(dm_test_output_color_space_bt2020_rgb_limited),
+	KUNIT_CASE(dm_test_output_color_space_default_rgb_auto_hdmi_cta),
+	KUNIT_CASE(dm_test_output_color_space_default_rgb_auto_hdmi_vga),
+	KUNIT_CASE(dm_test_output_color_space_default_rgb_auto_dp_cta),
+	KUNIT_CASE(dm_test_output_color_space_default_rgb_full_hdmi_cta),
+	KUNIT_CASE(dm_test_output_color_space_bt2020_rgb_auto_hdmi_cta),
 	KUNIT_CASE(dm_test_output_color_space_bt2020_ycc),
 	KUNIT_CASE(dm_test_output_color_space_default_ycbcr709_y_only),
 	KUNIT_CASE(dm_test_output_color_space_default_ycbcr601),