[Bug 101373] [KBL] modeset to a different refresh rate periodically results in a black screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101373

--- Comment #22 from Clinton Taylor <clinton.a.taylor at intel.com> ---
Here is a experimental patch that raises the HDMI voltage by ~200 mV. This may
help with signal integrity across the 2 hdmi cables between the motherboard and
the Denon if that is the issue.    


diff --git a/drivers/gpu/drm/i915/intel_ddi.c
b/drivers/gpu/drm/i915/intel_ddi.c
index 0914ad9..cc1dfd7 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -460,7 +460,7 @@ static int intel_ddi_hdmi_level(struct drm_i915_private
*dev_priv, enum port por

        if (IS_GEN9_BC(dev_priv)) {
                skl_get_buf_trans_hdmi(dev_priv, &n_hdmi_entries);
-               hdmi_default_entry = 8;
+               hdmi_default_entry = 9;
        } else if (IS_BROADWELL(dev_priv)) {
                n_hdmi_entries = ARRAY_SIZE(bdw_ddi_translations_hdmi);
                hdmi_default_entry = 7;

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