I can confirm the problem (Odroid N2, Samsung Q9FN). I was able to solve the problem by disabling the 1080 23.976 Hz, 24 Hz, 29.94 Hz, 25 Hz and 30 Hz modes. If the output is in 60 Hz, my TV switches to HDR - even at 1920x1080. In UHD resolution, everything runs smoothly with HDR.
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Interesting. This really does sound like a widespread firmware issue.
yes. seems like a Samsung issue 
I don’t trust this will change anytime soon.
I’m trying to think of a workaround that won’t impact other videos, and won’t require reboots etc.
is there a way to change allowed display modes using a script without reboot?
You can use the whitelist in Kodi.
updating:
the only way the 1080p @ 23.976 Hz HDR files played ok, was if I disabled ALL of the 1080p modes AND switched the resolution to 3860x2160p (to match the tv to the video’s refresh rate).
this can be automated to a 1 click keyboard action using JSON-RPC within a python script:
xbmc.executeJSONRPC('{"jsonrpc":"2.0","method":"Settings.SetSettingValue","params":{"setting":"videoscreen.whitelist","value":["0409602160024.00000pstd","0409602160023.97602pstd","0384002160060.00000pstd","0384002160059.94006pstd","0384002160050.00000pstd","0384002160030.00000pstd","0384002160029.97003pstd","0384002160025.00000pstd","0384002160024.00000pstd","0384002160023.97602pstd","0128000720060.00000pstd","0128000720059.94006pstd","0128000720050.00000pstd","0072000576050.00000pstd","0072000480060.00000pstd","0072000480059.94006pstd"]},"id":1}')
followed by
xbmc.executeJSONRPC(‘{“jsonrpc”:“2.0”,“method”:“Settings.SetSettingValue”,“params”:{“setting”:“videoscreen.resolution”,“value”:44},“id”:1}’)
an ugly, but needed workaround because samsung tv’s can’t play 1080p HDR when input via HDMI it seems.
Did you try some video file directly from flashdisk, connected to the TV? To be really sure that bluray fps has a problem? Seems pretty weird, but if that really happen due to vendor firmware, I would expect fix soon…
when playing from the tv itself (either network share, or attached storage) there’s no problem.
the problem is in the scenario where the tv needs to handle hdmi input with 1080p HDR signal (I only tried 23.976 fps).
I wouldn’t expect any fix, ever, because this type of content (1080p HDR) is not very popular.
Thats weird 
any chance to try box against TV with no updated firmware (or different TV)?
I like to setup TV’s outside internet, just for those “auto-update” reason and security. I seen quick LG menu when TV was bought, and sluggish shit after 3y with auto update. I guess they didnt test much for performance with models years back, and focus on present models more, but the bug you describe seems as major one for me…
everyone in this thread that has the same problem as me, have a Samsung TV.
I guess it’s something that goes back a few models/years…
anyway, I don’t have another TV to test it with, let alone an non-updated one 
I also disabled internet for my TV about 2 months ago, since it was “calling home” too frequently.
New information: Problem with 1080p HDR is not present on Samsung QE65Q80TA (2020). There are no issues with colors.
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I wonder if they’ll ever bother sending the fix the older models as well…
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