I also beleive auto brighness in art mode does not work properly on the frame 2021 43".
I was also under the impression this brightness adjustement was not working. It is quite difficult to judge if the brightness is actually changing dynamically. The solution I found is to measure it.
I have put a power meter to measure the TV consumption. There is a clear correlation between brightness setting in art mode and consumption.
| Consumption | Brightness level menu settings |
| 92W | 10 |
| 79W | 9 |
| 69W | 8 |
| 60W | 7 |
| 53W | 6 |
| 48W | 5 |
| 46W | 4 |
| 44W | 3 |
| 42W | 2 |
| 40W | 1 |
Note : setting 10 is the same consumption as TV mode.
To see if auto-brighness is working in art mode I did the following experiment: I started in the dark, then I swith on ambiant lights, then shined a strong lights to different angle on the screen. The sensors seems to be located on the bottom right
--> I do not perceive a change in brighness with my eyes, however I saw changes in power consumption which seems to indicate the algorithm do +1 or -1 setting based on the chosen brightness setting.
I have deactivated intelligent mode and enabled Brightness adapation. -->Same results.
I have the lastest firmware available on the TV menu.
=> Dear Samsung team, please consider changing your firmware to do +3 / -3 brightness adjustement if you want this function to be actually useful !
