diff --git a/src/plugins/platforms/drm/drm_gpu.cpp b/src/plugins/platforms/drm/drm_gpu.cpp
index 5c92d42b83..c2c356dd84 100644
--- a/src/plugins/platforms/drm/drm_gpu.cpp
+++ b/src/plugins/platforms/drm/drm_gpu.cpp
@@ -202,6 +202,7 @@ void DrmGpu::initDrmResources()
 
 bool DrmGpu::updateOutputs()
 {
+    waitIdle();
     DrmScopedPointer<drmModeRes> resources(drmModeGetResources(m_fd));
     if (!resources) {
         qCWarning(KWIN_DRM) << "drmModeGetResources failed";