HDMI output TX2

after capturing the HDMI output of the TX2, I have noticed that the transmitted values are modified for the Red, Green and Blue color components.
the modification is by a vlalue of one for colors between 211 and 254 and for 12 (output 11) and 15 (output 14).

I have downloaded L4T 28.2.1 (could’t find the 28.2 version) and examined dc.c to find a LUT which will explain these color modifications.

I have updated to l4T 32.1 and the result is the same.
on the Xavier I see different values for the Green, and Blues (it may be that a reduced LUT is used)

help would be appreciated to remove the color modification for the TX2.

Boris

ubuntu@tegra-ubuntu:/sys/devices$ cat /sys/module/tegra_fuse/parameters/tegra_chip_id
24

ubuntu@tegra-ubuntu:/sys/devices$ # R28 (release), REVISION: 2.0, GCID: 10567845, BOARD: t186ref, EABI: aarch64, DATE: Fri Mar 2 04:57:01 UTC 2018