[PATCH] [rfc] hack patch to fix dirty on offload screens

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The offload screens on an nvidia gpu show dirt on them, this is due to the
stuff not being flushed fully back to the CPU side and into main memory,
for the secondary GPU to pick it up from.

This is the hack I used to have in UXA, which works here, however I'm sure
this isn't acceptable for upstream, so let me know what else I could try.

Dave.
---
 src/sna/sna_accel.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/sna/sna_accel.c b/src/sna/sna_accel.c
index b40b99a..df8efb4 100644
--- a/src/sna/sna_accel.c
+++ b/src/sna/sna_accel.c
@@ -17638,7 +17638,9 @@ fallback:
 						    box, n, COPY_LAST))
 				goto fallback;
 
-			flush = true;
+			kgem_submit(&sna->kgem);
+			kgem_bo_map(&sna->kgem, __sna_pixmap_get_bo(dst));
+
 		}
 
 		DamageRegionProcessPending(&dirty->slave_dst->drawable);
-- 
2.4.2

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