I am experiencing a strange "bug" with Kodi 4K rendering on RPi4b. It did not work in LE v11, and still does not work in LE v12.
I have LG OLED C1 and Kodi user interface set to be rendered in 1920x1080@100Hz. I have however whitelisted all 4K modes (as per wiki https://wiki.libreelec.tv/configuration/4k-hdr#id-4k-60hz) and all Full HD modes.
Now, when playing 4K content (SDR, HEVC) the TV switches into 4K mode, but the movie is rendered in what seems to be a Full HD res (1920x1080) into the first quadrant. If I un-whitelist the 4K modes, the TV does not switch into 4K mode and the movie is again rendered in Full HD res correctly (and upsampled to 4K by TV). So it looks, like for some reason Kodi downsamples the content regardless the mode the TV is in.
I could have missed something fundamental in Kodi settings, but after several reviews I am still clueless. Anyone has any insight?