diff --git a/plugins/platforms/drm/drm_output.cpp b/plugins/platforms/drm/drm_output.cpp
--- a/plugins/platforms/drm/drm_output.cpp
+++ b/plugins/platforms/drm/drm_output.cpp
@@ -635,6 +635,15 @@
 
 void DrmOutput::transform(KWayland::Server::OutputDeviceInterface::Transform transform)
 {
+    // TODO: Rotation is currently broken in the DRM backend for 90° and 270°. Disable it for now to
+    //       not break user setups until it is possible again.
+    if (transform == KWayland::Server::OutputDeviceInterface::Transform::Rotated90 ||
+            transform == KWayland::Server::OutputDeviceInterface::Transform::Rotated270 ||
+            transform == KWayland::Server::OutputDeviceInterface::Transform::Flipped90 ||
+            transform == KWayland::Server::OutputDeviceInterface::Transform::Flipped270) {
+        return;
+    }
+
     waylandOutputDevice()->setTransform(transform);
     using KWayland::Server::OutputDeviceInterface;
     using KWayland::Server::OutputInterface;