[hdmkv]

Uploading a S912 Kodi Leia test .tar update for @hdmkv to test as well.

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@hdmkv, Suggest to do a LE settings .tar backup, and then copy this into the Update folder and reboot:
(there will be bugs, especially getting Hardware decoding to work reliably - it's Alpha Kodi software.)

LibreELEC-S912.arm-9.0-devel-20180221102512-r1-g28f08d0.img.gz 

Thanks, just tested w/your build and SSH'ing echo '422,12bit' > /sys/class/amhdmitx/amhdmitx0/attr ... I get 12-bit 422 Rec2020 HDR as expected, great, but 23.976 renders at 29.97, same as my Kodi/LE UI setting... getting close though, encouraging!
See my next post, working great.