[Bug 77436] KDE Konsole very slow scrolling with TearFree and QT graphics system native

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77436

--- Comment #75 from Chris Wilson <chris at chris-wilson.co.uk> ---
I think we will want to test next:

diff --git a/src/sna/gen7_render.c b/src/sna/gen7_render.c
index 3fcca3e..ad6ea32 100644
--- a/src/sna/gen7_render.c
+++ b/src/sna/gen7_render.c
@@ -2965,7 +2965,8 @@ fallback_blt:
                if (too_large(extents.x2-extents.x1, extents.y2-extents.y1))
                        goto fallback_blt;

-               if (can_switch_to_blt(sna, dst_bo, flags) &&
+               if ((sna->render_state.gen7.gt == 0 ||
+                    can_switch_to_blt(sna, dst_bo, flags)) &&
                    sna_blt_copy_boxes(sna, alu,
                                       src_bo, src_dx, src_dy,
                                       dst_bo, dst_dx, dst_dy,

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