[Bug 83600] [HSW] HDMI monitor does not work via active DisplayPort adapter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83600

--- Comment #17 from Jesse Barnes <jbarnes at virtuousgeek.org> ---
Yeah I guess that's possible, do you see tons of messages like that in the log?
 There were two series that affect our aux code posted recently, you could try
them and see if they help:

drm/dp: i2c-over-aux short write support

and

drm/dp: Print the number of bytes processed for aux nack

Another thought is that we always need to train at the max link width.  This
should force that even if we could potentially go lower:

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index d1141d3..dc02914 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -1238,6 +1238,8 @@ intel_dp_compute_config(struct intel_encoder *encoder,
        return false;

 found:
+       lane_count = max_lane_count;
+
        if (intel_dp->color_range_auto) {
                /*
                 * See:

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