[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 #135 from Chris Wilson <chris at chris-wilson.co.uk> ---
Yup. :(

As a final stab in this direction, please try:

diff --git a/src/sna/kgem.c b/src/sna/kgem.c
index 50a7da2..3058086 100644
--- a/src/sna/kgem.c
+++ b/src/sna/kgem.c
@@ -967,7 +967,7 @@ static bool __kgem_throttle(struct kgem *kgem)
         * too much and completely starve X. We will sleep again shortly,
         * and so catch up or detect the hang.
         */
-       if (ioctl(kgem->fd, DRM_IOCTL_I915_GEM_THROTTLE) == 0) {
+       if (drmIoctl(kgem->fd, DRM_IOCTL_I915_GEM_THROTTLE) == 0) {
                kgem->need_throttle = 0;
                return false;
        }

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