[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 #161 from Chris Wilson <chris at chris-wilson.co.uk> ---
Drat, no debugfs hack, so do you mind compiling a kernel with

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d23d114832fa..db61a1bd9b06 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3707,6 +3707,7 @@ static void __gen6_update_ring_freq(struct drm_device
*dev)
                        else
                                ia_freq = max_ia_freq - ((diff *
scaling_factor) / 2);
                        ia_freq = DIV_ROUND_CLOSEST(ia_freq, 100);
+                       ia_freq = max_ia_freq;
                }

                sandybridge_pcode_write(dev_priv,

applied?

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