Hi, > + bool has_out_fence; > + if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_OUT_FENCE)) { > + vgdev->has_out_fence = true; > + vgdev->ddev->mode_config.deferred_out_fence = true; Looks like you don't need has_out_fence, you can just use vgdev->ddev->mode_config.deferred_out_fence instead. take care, Gerd