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

[Wolfgang Haupt]

I've tried v4.14-rc1.
Now I do not have 4k at 60 anymore.

dmesg with drm.debug:
http://sprunge.us/TKbO


Best Regards,
Wolfgang

Jani Nikula <jani.nikula at linux.intel.com> schrieb am Di., 19. Sep. 2017 um
12:08 Uhr:

> On Mon, 18 Sep 2017, Wolfgang Haupt <haupt.wolfgang at gmail.com> wrote:
> > 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.
>
> Please try v4.14-rc1.
>
> BR,
> Jani.
>
>
> --
> Jani Nikula, Intel Open Source Technology Center
>
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