Comment 211 for bug 1098334

Sigh.

Probably,

diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
index 1580707..ba9c9bc 100644
--- a/src/sna/gen4_render.c
+++ b/src/sna/gen4_render.c
@@ -602,6 +602,7 @@ gen4_emit_pipe_break(struct sna *sna)
 inline static void
 gen4_emit_pipe_invalidate(struct sna *sna)
 {
+#if 0
        OUT_BATCH(GEN4_PIPE_CONTROL |
                  GEN4_PIPE_CONTROL_WC_FLUSH |
                  (sna->kgem.gen >= 045 ? GEN4_PIPE_CONTROL_TC_FLUSH : 0) |
@@ -609,6 +610,9 @@ gen4_emit_pipe_invalidate(struct sna *sna)
        OUT_BATCH(0);
        OUT_BATCH(0);
        OUT_BATCH(0);
+#else
+ OUT_BATCH(MI_FLUSH);
+#endif
 }