diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index e5b3c6dbd467..c972f24d50cc 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1087,18 +1087,20 @@ gen6_add_request(struct intel_engine_cs *ring)
 	int ret;
 
 	if (ring->semaphore.signal)
-		ret = ring->semaphore.signal(ring, 4);
+		ret = ring->semaphore.signal(ring, 6);
 	else
-		ret = intel_ring_begin(ring, 4);
+		ret = intel_ring_begin(ring, 6);
 
 	if (ret)
 		return ret;
 
+	intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_DISABLE);
 	intel_ring_emit(ring, MI_STORE_DWORD_INDEX);
 	intel_ring_emit(ring, I915_GEM_HWS_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 	intel_ring_emit(ring,
 		    i915_gem_request_get_seqno(ring->outstanding_lazy_request));
 	intel_ring_emit(ring, MI_USER_INTERRUPT);
+	intel_ring_emit(ring, MI_ARB_ON_OFF | MI_ARB_ENABLE);
 	__intel_ring_advance(ring);
 
 	return 0;