[Bug 108821] [DP MST + DP-HDMI] DisplayPort always defaults to incorrect limited-range RGB on FullHD external display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108821

--- Comment #24 from Ivan Vlk <ari at adyline.sk> ---
(In reply to Ville Syrjala from comment #23)
> 
> git clone git://github.com/vsyrjala/linux.git
> cd linux
> git checkout dp_mst_props
> zcat /proc/config.gz > .config
> make -j$(nproc)
> # just keep hitting enter to select the default value
> # for all the new config options it asks you about
> 
> # you seem to be running fedora so you can
> # probably just build an rpm for yourself with
> make binrpm-pkg

Thank you. I managed to built new kernel and install it. Now the options are
available:

DP-4 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
598mm x 336mm
        _MUTTER_PRESENTATION_OUTPUT: 0 
        EDID: 
                00ffffffffffff004c2d670b55353043
                15180103803c22782a9791a556549d25
                0e5054bfef80714f81c0810081809500
                a9c0b3000101023a801871382d40582c
                450056502100001e011d007251d01e20
                6e28550056502100001e000000fd0032
                4b1e5111000a202020202020000000fc
                00533237443339300a202020202001c0
                02031af14690041f1303122309070783
                01000066030c00100080011d00bc52d0
                1e20b828554056502100001e8c0ad090
                204031200c4055005650210000188c0a
                d08a20e02d10103e9600565021000018
                00000000000000000000000000000000
                00000000000000000000000000000000
                00000000000000000000000000000061
        max bpc: 12 
                range: (6, 12)
        Broadcast RGB: Automatic 
                supported: Automatic, Full, Limited 16:235
        audio: auto 
                supported: force-dvi, off, auto, on
        non-desktop: 0 
                range: (0, 1)
        link-status: Good 
                supported: Good, Bad
   1920x1080     60.00*+  50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08 

Can I expect this patch to be applied also to actual kernel stable branch,
please?

More info about the RGB range:

Mode is still Automatic, but RBG range is properly detected now. What really
surprised me is, that we I had "Full" mode before and that is what caused very
problematic color ranges. Now it's defaults to Limited and all seems pretty
normal again.

So, finaly, the problem was not unreachable Full range, but unreachable Limited
range. Why the colors are such blurry in Full mode, that's another question for
another topic (or ranges has inverted names by mistake?)

Thank you!
Ivan

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