[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 #148 from Chris Wilson <chris at chris-wilson.co.uk> ---
Worth trying just:

diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
index 637137e..dc80de3 100644
--- a/src/sna/gen4_render.c
+++ b/src/sna/gen4_render.c
@@ -660,9 +660,11 @@ inline static int gen4_get_rectangles(struct sna *sna,
                if (rem <= 0) {
                        if (sna->render.vertex_offset) {
                                gen4_vertex_flush(sna);
-                               if (gen4_magic_ca_pass(sna, op))
+                               if (gen4_magic_ca_pass(sna, op)) {
+                                       OUT_BATCH(MI_FLUSH |
MI_INHIBIT_RENDER_CACHE_FLUSH);
                                        gen4_emit_pipelined_pointers(sna, op,
op->op,
                                                                    
op->u.gen4.wm_kernel);
+                               }
                        }
                        OUT_BATCH(MI_FLUSH | MI_INHIBIT_RENDER_CACHE_FLUSH);
                        rem = MAX_FLUSH_VERTICES;

if you are happy that it reproduces reliably.

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