diff --git a/src/backend/drm/surface/atomic.rs b/src/backend/drm/surface/atomic.rs
index c0f64e9..f381b20 100644
--- a/src/backend/drm/surface/atomic.rs
+++ b/src/backend/drm/surface/atomic.rs
@@ -354,7 +354,7 @@ impl<A: AsRawFd + 'static> AtomicDrmSurface<A> {
                 source,
             })?;
 
-        let test_fb = self.create_test_buffer(pending.mode.size())?;
+        let test_fb = self.create_test_buffer(mode.size())?;
         let req = self.build_request(
             &mut pending.connectors.iter(),
             &mut [].iter(),
diff --git a/src/backend/drm/surface/gbm.rs b/src/backend/drm/surface/gbm.rs
index 3bc5be0..c587dd2 100644
--- a/src/backend/drm/surface/gbm.rs
+++ b/src/backend/drm/surface/gbm.rs
@@ -309,8 +309,11 @@ where
     /// Fails if the mode is not compatible with the underlying
     /// [`crtc`](drm::control::crtc) or any of the
     /// pending [`connector`](drm::control::connector)s.
-    pub fn use_mode(&self, mode: Mode) -> Result<(), Error> {
-        self.drm.use_mode(mode).map_err(Error::DrmError)
+    pub fn use_mode(&mut self, mode: Mode) -> Result<(), Error> {
+        self.drm.use_mode(mode).map_err(Error::DrmError)?;
+        let (w, h) = mode.size();
+        self.swapchain.resize(w as _, h as _);
+        Ok(())
     }
 }