[Intel-gfx] force yuv 4:2:0 output

[Wolfgang Haupt]

Hello everyone,

recently I played around with my kabylake i5 nuc box and found that on some
TV's
the screen stays black as soon as I go to 4k at 60.
The TV only accepts 4k at 60 at yuv 4:2:0 (I also saw hdmi range extenders and
stuff that don't support yuv 4:4:4 on 4k at 60).
I tried to force limited mode through xrandr or by overriding the edid
information, but nothing worked so far.
Now I wonder if there is a way to force yuv 4:2:0 ouptut on the kernel
level.
Thanks.


Kind Regards,
Wolfgang
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