video: choose render device in the frontend

src/backends/metal/video.rs

@@ -1105,10 +1105,6 @@ impl MetalBackend {
             },
         });
 
-        if self.ctx.get().is_none() {
-            self.make_render_device(&dev, false);
-        }
-
         let (connectors, futures) = get_connectors(self, &dev, &resources.connectors)?;
 
         let slf = Rc::new(MetalDrmDeviceData {

src/state.rs

@@ -283,6 +283,11 @@ impl State {
         if let Some(config) = self.config.get() {
             config.devices_enumerated()
         }
+        if self.render_ctx.get().is_none() {
+            if let Some(dev) = self.drm_devs.lock().values().next() {
+                dev.make_render_device();
+            }
+        }
     }
 
     pub fn set_render_ctx(&self, ctx: Option<&Rc<RenderContext>>) {