[Bug 111452] Dull colors with kernel 5.2.0 on external monitors with intel-gfx
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Wed Aug 21 12:29:30 UTC 2019
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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