Auto refresh rate issue in GPU RGB full mode.

Hi,

I trying to find the best combination of settings for my system, regarding the RGB full / limit settings. I got an issue with my GPU with RGB full settings and automatic refresh rate change.

I´ve been using this article to study:
video_levels_and_color_space (wiki)

According to above page, best solution for watching video material is to have: full (Kodi), full (GPU), full (TV) OR limited (Kodi) , full (GPU), limited (TV). I´m targeting to have system with full, full, full settings. Or the other one is ok also, but GPU should be in RGB full mode.

I´m not very good with Linux, but I was able to change GPU colour space mode through Putty. I used command:
xrandr –output HDMI2 –set “Broadcast RGB” “Full”

I added the line into autostartup.sh script and placed in into /storage/.config/. So after reboot GPU is in “RGB full” mode. I used xrandr –prop to see the present settings.

But when playing video on Kodi, the automatic refresh rate change is not working.

Seems that I´m missing out something here… is there a linux guru here, who could point me into right direction?

The default mode in GPU is “Broadcast RGB” “Video 16:235 pass-through”. In this mode the automatic refresh rate change is working.

My system:
HTPC: Intel NUC Kit DCCP847DYE
Software: Libreelec 8.0
AVR: Marantz NR1506
TV: Samsung UE55H6675STXXE (supports full and limited)

HDMI route: HTPC (HDMI2) -> AVR -> TV

-Thanks for help