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<body><span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB DP] Banded colors/reduced depth over Thunderbolt on Mac Mini Server 2012 (6,2)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59113">bug 59113</a>
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<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
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<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>NEEDINFO
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB DP] Banded colors/reduced depth over Thunderbolt on Mac Mini Server 2012 (6,2)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59113#c9">Comment # 9</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO --- - [IVB DP] Banded colors/reduced depth over Thunderbolt on Mac Mini Server 2012 (6,2)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=59113">bug 59113</a>
from <span class="vcard"><a class="email" href="mailto:daniel@ffwll.ch" title="Daniel Vetter <daniel@ffwll.ch>"> <span class="fn">Daniel Vetter</span></a>
</span></b>
<pre>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)</pre>
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