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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
QDguru
Apprentice
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I've said it already but this can't and won't be fixed. If you've the option to return your TV then you probably should if you find the reality of these TVs not being able to maintain peak brightness

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jayh89
Helping Hand
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It keeps peak brightness in every other mode except game mode/HDR. So it CAN keep peak brightness but it doesn’t in game mode. Other Samsung models from say 2019 etc also work fine. So I don’t believe that whatsoever. 

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QDguru
Apprentice
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You keep waiting on that miracle fix pal 😂

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LCDeez
Navigator
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Agree with you here, I can scorch my eyeballs out in SDR with brightness all the way up and no dimming happens. It’s an algorithm issue for sure, not a hardware panel defect.

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Muzzakus
Explorer
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Is Samsung know for fixing issues?  Why is there no acknowledgement of the dimming bug and broken array dimming in game mode?  Has ghosting been properly addressed?

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Suriya
Voyager
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Tonight or tomorrow I'll update my follow-up. have been waiting for someone to reply. but I'm pretty sure we're very close to the next update as everyone in the Samsung officials expecting update to roll-out.  which is primarily for game-mode but not sure the update will fix it or not.

QuantumP
Pathfinder
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Of course we are close to another update, that is how time works. The odds of another update coming soon are high as when there hasn't been one for a while, then it is inevitable that a new one will come soon. Nothing to do with your so called insider information from "Samsung officials". 

 

What the update contains, is anyones guess. But I am sure you have the insider information from your "officials" 😂

 

 

daparky
Pathfinder
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Well Samsung have until middle of November to push an update out that fixes the following issues:-

 

- Local dimming enabled in Game mode

- Dimming bug

- Ghosting issue (some say it's fixed, others say it isn't)

 

Does anyone think they'll be issues using next gen console on Samsung 2020 models? Seems like I need to wait until people test next gen on them. Worst thing is VRR or some HDMI 2.1 feature are buggy.

soma-m
Student
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I feel he's just trying to help in whatever way he can.

 

I feel we shouldn't be attacking each other on this post, since,

  • It does not have any benefit.
  • It might discourage other people from taking action and posting useful info.

I feel the best way to force Samsung to take this problem seriously, is to write bad reviews on Youtube videos and shopping websites. For example, if we write on samsung's official QLED video it will definitely get a lot of attention from many people and might force Samsung to respond publicly.

HQboy
Navigator
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I agree, I've been posting in several videos of them, if everyone did. Also put on video of youtubers who do reviews of the qleds.

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