Librem 5/13/15 iGPU internal LUT table?

hello !
i would please like to ask Purism (first-and-foremost) what the internal look-up table (LUT) for the igpu in the librem 5/13/15 is ? is it 8bit (no dithering by default) or is it more 12bit (or more) with dithering applyed by default ?
i require this information because it affects hardware monitor calibration and profiling (precision)

ps: on the librem 5 igpu i guess it’s 8bit no-dithering by default but i would still like to know for sure and if it is possible to change no-dithering to dither ?

bump @mladen