[Bug 111452] Dull colors with kernel 5.2.0 on external monitors with intel-gfx

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111452

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 features|                            |display/color management
      i915 platform|                            |SKL
                 CC|                            |ville.syrjala at linux.intel.c
                   |                            |om

--- Comment #1 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Bernd Buschinski from comment #0)
> 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 <ville.syrjala at linux.intel.com>
> 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 <ari at adyline.sk>
>     Tested-by: Ivan Vlk <ari at adyline.sk>
>     Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108821
>     Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
>     Reviewed-by: Jani Nikula <jani.nikula at intel.com> #v1
>     Link:
> https://patchwork.freedesktop.org/patch/msgid/20190326142556.21176-1-ville.
> syrjala at linux.intel.com
> 
>  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: https://bugzilla.kernel.org/show_bug.cgi?id=204351

@Ville Any comments?

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