[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 #26 from Chris Wilson <chris at chris-wilson.co.uk> ---
I still haven't explained how we end up with the backlog, but perhaps this will
help again with alleviating the symptoms:

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index a840ed6..7ba3ac9 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -4194,6 +4194,12 @@ static void __kgem_bo_make_scanout(struct kgem *kgem,
            do_ioctl(kgem->fd, DRM_IOCTL_MODE_ADDFB, &arg) == 0) {
                bo->scanout = true;
                bo->delta = arg.fb_id;
+
+               /* Pre-emptively move the object into the mappable
+                * portion to avoid rebinding later. */
+               bo->map__gtt = __kgem_bo_map__gtt(kgem, bo);
+               if (bo->map__gtt)
+                       *bo->map__gtt = 0;
        }
 }

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