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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77436#c27">Comment # 27</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - KDE Konsole very slow scrolling with TearFree and QT graphics system native"
href="https://bugs.freedesktop.org/show_bug.cgi?id=77436">bug 77436</a>
from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
<pre>diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index a840ed6..24841dd 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)
+ *(uint32_t *)bo->map__gtt = 0;
}
}</pre>
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