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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Dull colors with kernel 5.2.0 on external monitors with intel-gfx"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111452">bug 111452</a>
<br>
<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>
</td>
<td>display/color management
</td>
</tr>
<tr>
<td style="text-align:right;">i915 platform</td>
<td>
</td>
<td>SKL
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>ville.syrjala@linux.intel.com
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Dull colors with kernel 5.2.0 on external monitors with intel-gfx"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111452#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Dull colors with kernel 5.2.0 on external monitors with intel-gfx"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111452">bug 111452</a>
from <span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre>(In reply to Bernd Buschinski from <a href="show_bug.cgi?id=111452#c0">comment #0</a>)
<span class="quote">> With kernel 5.2.0 my colors on my external monitors are kind of dull.
> Meaning the contrast seems lower and the gamma seems higher.
> It worked fine with kernel 5.1.0.
>
> It can be worked around with:
>
> xrandr --output DP-1-1 --set 'Broadcast RGB' 'Full'
> xrandr --output DP-1-2 --set 'Broadcast RGB' 'Full'
>
> Only the external monitors (connected via laptop -> docking station ->
> display port) are affected. The laptop display is fine.
>
>
> I started bisecting it and result is:
>
> 37aa52bff2bcd4377c0f747f730f3d436f2fe58e is the first bad commit
> commit 37aa52bff2bcd4377c0f747f730f3d436f2fe58e
> Author: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
> Date: Tue Mar 26 16:25:51 2019 +0200
>
> drm/i915: Add broadcast RGB property for DP MST
>
> Add the "Broadcast RGB" property to MST connectors, and implement
> the same logic for it as we have in the SST code.
>
> v2: Extract and reuse intel_dp_limited_color_range()
>
> Cc: Ivan Vlk <<a href="mailto:ari@adyline.sk">ari@adyline.sk</a>>
> Tested-by: Ivan Vlk <<a href="mailto:ari@adyline.sk">ari@adyline.sk</a>>
> Bugzilla: <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [DP MST + DP-HDMI] DisplayPort always defaults to incorrect limited-range RGB on FullHD external display"
href="show_bug.cgi?id=108821">https://bugs.freedesktop.org/show_bug.cgi?id=108821</a>
> Signed-off-by: Ville Syrjälä <<a href="mailto:ville.syrjala@linux.intel.com">ville.syrjala@linux.intel.com</a>>
> Reviewed-by: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>> #v1
> Link:
> <a href="https://patchwork.freedesktop.org/patch/msgid/20190326142556.21176-1-ville">https://patchwork.freedesktop.org/patch/msgid/20190326142556.21176-1-ville</a>.
> <a href="mailto:syrjala@linux.intel.com">syrjala@linux.intel.com</a>
>
> drivers/gpu/drm/i915/intel_dp.c | 39
> ++++++++++++++++++++++++-------------
> drivers/gpu/drm/i915/intel_dp_mst.c | 15 ++++++++++++--
> drivers/gpu/drm/i915/intel_drv.h | 2 ++
> 3 files changed, 40 insertions(+), 16 deletions(-)
>
>
>
> CPU: Intel(R) Core(TM) i5-6300U CPU @ 2.40GHz
> Laptop: Dell Latitude E7470
> Software:
> - xorg-server-1.20.5
> - mesa-19.1.3
> - libdrm-2.4.99
>
>
> Kernel Bugzilla Link: <a href="https://bugzilla.kernel.org/show_bug.cgi?id=204351">https://bugzilla.kernel.org/show_bug.cgi?id=204351</a></span >
@Ville Any comments?</pre>
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