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2020 QLED T models (Q80T, Q90T, Q800T, Q900T) HDR game mode brightness / local dimming bug

(Topic created on: 10-05-2020 11:59 PM)
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Rauttis
Explorer
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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:

  1. Set brightness to max (50)
  2. Set local dimming to standard (bug happens on high as well)
  3. Enable game mode
  4. Turn off game motion plus
  5. Turn off intelligent mode and all the brightness related settings in eco settings, as these can influence the brightness level of the tv.
  6. Launch a game that runs in HDR
  7. Start your stopwatch
  8. Do whatever you want in the game or you can also go back to PS4 menus, find a bright scene where you can notice a brightness drop easily
  9. When the stopwatch hits 6 minutes, you should see the TVs brightness suddenly drop by a large amount. By eye the brightness drop seems about equal to dropping the brightness from 50 -> 30 by hand.
  10. Go to picture settings and set local dimming to low (brightness does not change)
  11. Set local dimming back to standard (brightness suddenly jumps to the original level. Brightness can be restored by switching input away and back as well, or by disabling and re-enabling game mode)
  12. And again after EXACTLY 6 minutes the bug again repeats and the brightness drops down again

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

2,028 REPLIES 2,028
HQboy
Navigator
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Friend, very calm in what you say. In my country (Brazil) it came out at 1402.7. File exactly identical to what he made available to us.

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HQboy
Navigator
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Friend, can you share your settings in game mode please?

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Soccercrazy1
Pioneer
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I don't believe there is a correct setting. Just play with it and get it how you want. 

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HQboy
Navigator
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I liked your results. Couldn't you share it with us?

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jayh89
Helping Hand
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So you prefer GMP on? Interesting. I find it hard to see differences but I can’t say I’ve investigated enough. Could you share your game mode settings out of curiosity? 

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Soccercrazy1
Pioneer
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Removed picture settings

SidL
Pathfinder
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Is local dimming working perfectly with GMP OFF, as it was before the 1304 update? What version did you install on your TV, 1402.6 or 1402.7? Because the firmware that Suriya made available did not correct the local dimming with GMP OFF !!

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SidL
Pathfinder
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Pelas fotos que o soccercrazy1 disponibilizou na dele o local dimming com o GMP desativado esta funcionando como era antes da 1304

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DUSKTILLDAWN
Pioneer
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I'm guessing most people on here have PS4 because Xbox freesync HDR is so dark it's unplayable,I keep mine on GMP with judder notch to 1 to bring colour back ,hgig is on , earlier it looked to dark but my contrast was set wrong ,but GMP off I get faint scrolling upward lines in dash which is really annoying to me,changed cable ,changed input hdmi socket,same happening on 1304 and 1402 for me,tried console on another TV it doesn't do it do definitely issues with GMP or  freesync HDR ,but dimming is not present for me on console in UK ,other issues are probably worse

 

 

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Soccercrazy1
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I have 1402.1 in the US and I downloaded it from Samsung website. I only had 1304 when I bought the tv. I have not seen the previous versions. The comparisons you have seen are 1304 and 1402.1

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