[Bug 55500] [sna gen4 w/a] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #181 from Chris Wilson <chris at chris-wilson.co.uk> ---
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
 }

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