diff --git a/dlls/d3d11/device.c b/dlls/d3d11/device.c
index f9db15f12fd..5873be680dc 100644
--- a/dlls/d3d11/device.c
+++ b/dlls/d3d11/device.c
@@ -1179,10 +1179,23 @@ static void STDMETHODCALLTYPE d3d11_immediate_context_ResolveSubresource(ID3D11D
         ID3D11Resource *src_resource, UINT src_subresource_idx,
         DXGI_FORMAT format)
 {
-    FIXME("iface %p, dst_resource %p, dst_subresource_idx %u, src_resource %p, src_subresource_idx %u, "
-            "format %s stub!\n",
-            iface, dst_resource, dst_subresource_idx, src_resource, src_subresource_idx,
-            debug_dxgi_format(format));
+    struct d3d_device *device = device_from_immediate_ID3D11DeviceContext(iface);
+    struct wined3d_resource *wined3d_dst_resource, *wined3d_src_resource;
+    enum wined3d_format_id wined3d_format;
+
+    TRACE("iface %p, dst_resource %p, dst_subresource_idx %u, "
+            "src_resource %p, src_subresource_idx %u, format %s.\n",
+            iface, dst_resource, dst_subresource_idx,
+            src_resource, src_subresource_idx, debug_dxgi_format(format));
+
+    wined3d_dst_resource = wined3d_resource_from_d3d11_resource(dst_resource);
+    wined3d_src_resource = wined3d_resource_from_d3d11_resource(src_resource);
+    wined3d_format = wined3dformat_from_dxgi_format(format);
+    wined3d_mutex_lock();
+    wined3d_device_resolve_sub_resource(device->wined3d_device,
+            wined3d_dst_resource, dst_subresource_idx,
+            wined3d_src_resource, src_subresource_idx, wined3d_format);
+    wined3d_mutex_unlock();
 }
 
 static void STDMETHODCALLTYPE d3d11_immediate_context_ExecuteCommandList(ID3D11DeviceContext *iface,
diff --git a/dlls/d3d11/tests/d3d11.c b/dlls/d3d11/tests/d3d11.c
index 93184ada601..e0769a75a11 100644
--- a/dlls/d3d11/tests/d3d11.c
+++ b/dlls/d3d11/tests/d3d11.c
@@ -24999,13 +24999,10 @@ static void test_alpha_to_coverage(void)
 
         get_texture_readback(readback_texture, 0, &rb);
         SetRect(&rect, 0, 0, 200, 200);
-        todo_wine
         check_readback_data_color(&rb, &rect, expected_color, 1);
         SetRect(&rect, 200, 0, 640, 200);
-        todo_wine
         check_readback_data_color(&rb, &rect, 0xffffffff, 1);
         SetRect(&rect, 0, 200, 640, 480);
-        todo_wine
         check_readback_data_color(&rb, &rect, 0xffffffff, 1);
         release_resource_readback(&rb);
     }