I bought a Q80T a couple of days ago and have noticed a really annoying issue when using the tv with the combination of HDR and game mode.
I'm fairly certain this is a software bug in the TV since I can reproduce this issue with 100% accuracy, and it happens on the dot at the same moment every time. It's basically on a timer.
Basically when the game is displaying a HDR signal and game mode is enabled, exactly after 6 minutes the brightness of the TV suddenly drops by around 20 (50 -> 30). The value of brightness setting doesn't actually change however. Messing with the brightness setting does not restore the brightness to it's original state, but changing the local dimming setting from standard to low and then back to standard does. Switching game mode off and then back on also fixes the issue, but then it happens again EXACTLY after 6 minutes (I've timed this with a stopwatch).
Has anyone else experienced this issue? Or can someone maybe test this on their TV to see if you can reproduce it?
Exact repro steps on how I can reproduce this 100% of the time on the PS4 Pro:
Some other notes: The PS4 has a screensaver that basically dims the screen if it is idle for a while. This is not the cause of this, this happens even when the console is in active use and the brightness can be restored temporarily by changing the local dimming setting like described above. I have not managed to reproduce this issue with game mode off, so it seems to be related to game mode.
Software version: 1304
To be honest im pretty sure ive disabled all eco setting anyway. Would love some help from an administrator with this, clearly seems to be a known issue.
Yup, same issue on the US Q90T. Game mode dimming occurs but only when game motion is completely turned off. Also, a little ghosting happens as well in some games (not inverse but more like blown out highlights and weird light pulse stuff). It will always happen like the OP mentioned and dims probably close to 20 or 30 of the total brightness. The real problem I have with this is that I want to take advantage of the super low input lag but the only way to play games right now is to have both game mode and game motion on together. Input lag with these two hovers around 22ms.