diff --git a/src/vp8.c b/src/vp8.c
index 3e94032..3916db5 100644
--- a/src/vp8.c
+++ b/src/vp8.c
@@ -301,6 +301,13 @@ int vp8_set_controls(struct request_data *driver_data,
 		for (k = 0; k < 11; k++)
 			fprintf(stderr, "%u ", frame.entropy.coeff_probs[0][0][0][k]);
 		fprintf(stderr, "\n");
+		fprintf(stderr, "vp8: VAAPI-src probability_set=%d dct_coeff_probs[0][0][0][0..11]=",
+			probability_set);
+		for (k = 0; k < 11; k++)
+			fprintf(stderr, "%u ", probability->dct_coeff_probs[0][0][0][k]);
+		fprintf(stderr, "\n");
+		fprintf(stderr, "vp8: VAAPI-src probability size=%zu ptr=%p\n",
+			sizeof(*probability), (void *)probability);
 		(void)p;
 	}