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@leepberry if you have the ECO Sensor OFF it doesn’t do it for me when playing media. Before that the screen would get very very dark when playing videos, after that it still might do a little of it (5-10%), but it’s barely noticeable. If you are using Windows 10 make sure to turn off PLAY HDR in the display settings, that tripped me up as well. Other than that, I would suggest just experimenting a bit more with the hidden options.

An addendum to that is that somehow these TVs auto “correct” themselves after a certain amount has passed, so the Ambient Sensor comes back - even though no other settings get affected or a Software Update is performed - not sure if someone somewhere in Samsung HQ triggers this manually, but I’ve had to redo it 2 times now.

So I actually found a “solution” for this. Went into the secret service menu for Samsung TVs - you press the MUTE button then 1, 8, 2 and the Power button fast enough and the TV will restart in a special mode. Wait for it to retrieve some data on the right, when you see it, go to the OPTION, then MRT Options and find the ECO Sensor - turn it OFF. Then stop the TV with the Power button, wait for it a bit and then turn it on in 5 seconds. Your setting for the picture would have changed to Dynamic, but just revert it back to Movie or whatever mode you prefer and all is good now - NO MORE AUTO BRIGHTNESS crazyness in fullscreen video or games.

The only downside to this is that the Ambient Sensor option is now gone from the menu as well, so no more magically adjustable screen brightness - you shouldn’t use that either way, it’s implement in a terrible way and bad for Movie quality too.

Yeah this is very annoying, is there any news on new firmware that allows one to turn this off ?