Wrong RGB values from DP output with JetPack 4.4.1

I am using a Nvidia Jetson Xavier NX Developer Kit with Jetpack 4.4.1.
I want to code some data on the RGB values, so I need to be able to set specific color values and receive them from the Jetson’s output exactly as I set.
When I set a full screen with the following color:
R = 12, G = 12, B = 12
I receive:
R = 26, G = 26, B = 26
I followed the fix from this post (my older post, but for Jetpack 4.5.1):

The problem, that the fix for DP doesn’t work here (HDMI did work as in Jetpack 4.5.1).
When i disable the LUT with cmu_enable = 0, i receive the following color:
R = 16, G = 16, B = 16
And when i try to disable gamma, with degamma=1 i received the same value as before writing to these registers:
R = 26, G = 26, B = 26
I tried to write to all the windows of tegra_win, but it didn’t change anything.
Unfortunately, i have to run with Jetpack 4.4.1 this time, so i need to find a way to disable LUT and gamma.
Please help.

There is no update from you for a period, assuming this is not an issue any more.
Hence we are closing this topic. If need further support, please open a new one.

Since the kernel source is public, how about you directly check whether this is caused by kernel or not?