[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 #120 from Chris Wilson <chris at chris-wilson.co.uk> ---
Maybe something like:

diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
index 9c24ea6..6835bda 100644
--- a/src/sna/sna_display.c
+++ b/src/sna/sna_display.c
@@ -6495,6 +6495,7 @@ fixup_flip:
                                                        mode = KGEM_BLT;
                                                DBG(("%s: marking flip bo as
busy [%x -> mode=%d]\n", __FUNCTION__, busy.busy, mode));
                                                kgem_bo_mark_busy(&sna->kgem,
flip_bo, mode);
+                                               sna->kgem.need_throttle = true;
                                        } else
                                                __kgem_bo_clear_busy(flip_bo);
                                }
@@ -6511,6 +6512,11 @@ fixup_flip:
                        assert(old->refcnt >= 1);
                        set_shadow(sna, region);
                }
+
+               if (sna->kgem.need_throttle) {
+                       drmCommandNone(sna->kgem.fd,
DRM_IOCTL_I915_GEM_THROTTLE);
+                       sna->kgem.need_throttle = false;
+               }
        } else
                kgem_submit(&sna->kgem);

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