Odd gradual dimming behaviour on MAG 273QP QD-OLED

[Verlei]

I've been noticing a consistent pattern of dimming since the day I got this monitor. Dimming happens on SDR mode, TrueBlack400, at 30% brightness, regardless of content's brightness.
It always gradually dims to 10-20% brightness in 1 minute span into game-related moving contents (Apex Legends, Overwatch, Genshin, Monster Hunter, Marvel Rivals). Happens to recorded footages (i.e. YT videos) too. I measured the brightness with a phone app named LUX meter.

I've tried:

1. - Reset Nvidia settings and reinstall its drivers (3060 Ti)​
2. - Reset monitor settings
   • - Use HDR - dimming is mitigated to great extent in HDR mode. No idea why.
   • - Use Peak 1000 nits​
   • - Turn off OLED care​
   • - Turn off ABSL in service menu​
   • - sRGB & Display P3​
   • - AI Vision ON OFF​
   • - Gsync ON OFF​

I've noticed:
- Opening white or black windows restores the monitor to max brightness. (i.e. Discord/Nvidia control panel)
- Dimming occurs much later in 60Hz, much earlier in 240Hz
- Dimming does not occur on content that has less screen activity (i.e. movies)
- Dimming is prevalent and much stronger in SDR mode
- Barely warm monitor panel in SDR

The monitor is mostly fine. I just don't understand how its dimming algorithm works. Let me know if this is actually normal on all Samsung QD-OLEDs, because I haven't seen anyone reporting this specific issue. Otherwise, I will request for replacement from MSI directly.

Note: I've talked to MSI support. Their explanation (attached) makes sense, but doesn't tell me why dimming occurs on very low monitor brightness.

 

[fauc]

1. Because brightness will be controlled by HDR when HDR is ON so please modify HDR to OFF for checking.

2.Night Vision / AI Vision / Adaptive-Sync / Low Blue Light / Static Screen Detection / Multi Logo Detection / Taskbar Detection / Boundary Detection are will be adjust brightness so please modify all to OFF for checking.

 

[Verlei]

1. Because brightness will be controlled by HDR when HDR is ON so please modify HDR to OFF for checking.

2.Night Vision / AI Vision / Adaptive-Sync / Low Blue Light / Static Screen Detection / Multi Logo Detection / Taskbar Detection / Boundary Detection are will be adjust brightness so please modify all to OFF for checking.

Appreciate your quick response!

1. Dimming is mostly engaging in HDR off
2. Those are all already off too

I also tried looking for setting like "Dynamic contrast" on Windows and monitor but to no avail.

 

[NinoPanino]

I too have the same monitor. I can confirm I have noticed the monitor occasionally dimming the screen on SDR content.
Perhaps this is a firmware bug ?

 

[vekspec]

Just received my monitor today and can confirm brightness dims on it's down. Playing WoW, amazing visuals/brightness but after like a minute it gets dim on it's own. This is using True Black 400. Reading other models have similar thing going on and seems hasn't been "fixed"

 

[FlyingScot]

I have noticed that many games appear to have this dimming thing when moving from inside to outside buildings, and in some cases even inside rooms with a bright source of light. It could be a monitor behavior on my IPS panel, but I haven’t been able to pinpoint what is going on.