[Bug 59113] [IVB DP] Banded colors/reduced depth over Thunderbolt on Mac Mini Server 2012 (6,2)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59113

Daniel Vetter <daniel at ffwll.ch> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #9 from Daniel Vetter <daniel at ffwll.ch> ---
Just checked your logs, we don't dither ... strange.

Can you please test whether this quick hack here changes anything?

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 1b63d55..bb3f9d5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -198,6 +198,10 @@ intel_dp_adjust_dithering(struct intel_dp *intel_dp,
        mode_rate = intel_dp_link_required(mode->clock, 24);
        max_rate = intel_dp_max_data_rate(max_link_clock, max_lanes);

+       if (adjust_mode)
+               mode->private_flags
+                       |= INTEL_MODE_DP_FORCE_6BPC;
+
        if (mode_rate > max_rate) {
                mode_rate = intel_dp_link_required(mode->clock, 18);
                if (mode_rate > max_rate)

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