Any way to determine which one is the culprit (windows or tv itself) of dimming software not working correctly?

[mfessler 0]

Hello.
Wanted to ask everyone experienced (or not :)) about nowadays 4k tvs. If anyone can say anything related to the topic I appreciate it.

My problem (or rather hesitation) is as follows:
I want to buy soon new 4k TV for just convenience sake and mostly health of my eyes (so less squinting and straining) but I hesitate about one and only thing that bothers me and that is the use of monitor dimming/overlay software for ofcourse reducing flashbang-like brightness of monitor for my very sensitive eyes.

My issue is this - I want to buy new big screen tv but I currently have one FHD TV (kinda old I believe) connected to laptop through hdmi, while this setup is ok cuz bigscreen I would like to dim screen more beyond tv settings but the thing is:
- software I use is both on laptop + tv setup
- something is picky either software or windows or somehow tv
- laptop + tv setup wont allow me to dim screen of TV connected beyod tv settings using dim software (software dims screen of laptop but on connected tv it omits)
- my second gaming pc setup (desktop nvidia GPU --> hdmi to FHD small monitor) works just fine with same software I use to dim screen like 99% of time an I am happy with it.

Software I use:

https://www.autosofted.com/easyeyes/

Which is by the way only best Ive found so far (not perfect but it just works like it should majority of time)

So my question here is - how (if so) can I troubleshoot whats is culprit here that same software (and same windows) doesnt work at all on laptop + TV setup but works on Desk GPU + regular monitor?
I hesitate to change my desktop GPU monitor to new 4k tv I want to buy just cause the issue with current laptop + FHD tv I have, I am afraid that it would be the same case and
sofware wouldnt dim screen on new tv. which is a total dealbreaker for me.
Any way to check it somehow? tv specs?

Thanks.