[wrxtasy]

If possible when playing 4K HDR with that config, issue a:

Code:

cat /sys/class/amhdmitx/amhdmitx0/attr

and tell me what it outputs.

THIS(click) is the Chroma and bit depth logic we are dealing with.

EDIT: I've separated the refresh switching from the Chroma and Bit depth which is enabled by a call to sys/class/display/mode
You should see 422,12bit when using this modded version with the Kodi settings combo you have above.

LibreELEC-S912.arm-8.2.4.2-Exp-422-v2.tar