[Bug 55500] [sna gen4] 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 #129 from Chris Wilson <chris at chris-wilson.co.uk> ---
As a check that all problems are the same, can people who are still affected by
this do a test with

diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
index a87af39..86c37d6 100644
--- a/src/sna/gen4_render.c
+++ b/src/sna/gen4_render.c
@@ -63,7 +63,7 @@
 #define NO_FILL_BOXES 0
 #define NO_VIDEO 0

-#define MAX_FLUSH_VERTICES 6
+#define MAX_FLUSH_VERTICES 1

 #define GEN4_GRF_BLOCKS(nreg)    ((nreg + 15) / 16 - 1)

and see if that cures the last of the corruptions.

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