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Original topic:

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

(Topic created on: 11/05/20 00:59)
Rauttis
Apprentice
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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

1,916 REPLIES 1,916
CarlH
Moderator
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Hi @Rauttis. Can you confirm the software version you're currently running on your TV? This can be found by pressing Settings on the remote and going to Support > About this TV. 

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Rauttis
Apprentice
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The version is 1112. According to the TV there are no newer versions available.

The more specific version under about this tv is: T-NKMDEUC-1112.9, B0040700/B30200, BT - S

 

I've also managed to reproduce this issue on a Nvidia Shield now just to confirm this is not a PS4 specific issue. The steps are basically the same. Enable game mode and watch something with HDR. After exactly 6 minutes the brightness of the TV drops by a large amount and does not return back to the original level by itself.

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moejeremiah
New Member
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Having the exact same issue with the xbox one x.

RouDeR
Pathfinder
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I have similar issue with the brightness on my 75 inch Q800T even without GameMode or HDR.

It is 100% related to the Local dimming algorithm.

When my picture gets dimm > I need to change my LD settings to Low, then back to High or Standard to get the brightness again.

Workaround for this issue is to access the Service Menu and there is an option to disable Local Dimming support for PC MODE.  I did that and I no longer have brightness fluctuation! However the cost of not having Local Dimming is too high, SAMSUNG MUST FIX THIS WITH SOFTWARE UPDATE!

Software version 1115.5

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funkybananas
Apprentice
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Noticed this on my Q95T too in game mode. No fluctuations out of that mode thankfully! 

 

Any word on a fix for this?

max0x7ba
Apprentice
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Same issue on my Q95T in any mode with local dimming other then low.

 

However, I use low local dimming in all modes, anything above it does too much brightness and contrast, which destroys the scene atmosphere and is too much, and makes text look weird, IMO. 

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RiotRMD
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Hi all,

 

I swear I have only started seeing this in the past three days. I've owned the tv for 3 weeks. Ever since I got it, I've had firmware 1302, but manually updated to 1304 today via a download from Samsung Europe's site.  American site seems to have 1301.5. (I love how they have no "patch notes", its ironic, I write those at work and tend to keep them short :face-with-tears-of-joy: )

 

Is this "Inverse Ghosting?" I havent seen this happen up until a few days ago and it's driving me crazy since I'm sure it wasn't there before.

 

 

 

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Richierich99
Pathfinder
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I have the UK Samsung q85t 65inch model. 

Firmwure 1302 latest I believe.

 

HDR game mode I can confirm my screen does not go dim! Using ps4 pro

 

Although my screen I think dosent go as bright (example) as my ks8000 went alot brighter!

I thought these qleds were brighter, but I guess that's another thread I shall be doing soon!

 

And yes my q85t gets quite hot! 

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LCDeez
Navigator
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Did you turn game motion off with dimming at standard or high? 

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Suriya
Voyager
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I'm 100% sure you're wrong. First turn off game motion plus then trigger any game with HDR in game-mode keep static content(to identify clearly) on screen for 10min you'll see the brigthness drop by 40%.

 

Wondering why you came here if the dimming didn't happen?

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smp79
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That's not a software issue - it's just a slow LCD panel.

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RiotRMD
Apprentice
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You mean the ghosting? The issue with that is that I didnt have that a week ago and the firmware is the same, so that's what is bugging me.

 

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Alekkk
Explorer
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Should probably make a separate thread for this, but I also noticed that a while back when playing Dark Souls III, and it went away when I turned off FreeSync. (I was on PC with Game mode.) Never seen anything like it before and would have sworn it wasn't there before. Think I had updated firmware, but this was way back on 1115 or something. Also noticed it recently just watching a video of Bloodborne; again, went away when I turned off FreeSync. Did you find out if this is 'inverse ghosting'? Would love to know if you figure out what's going on, and if it's a bad implementation of FreeSync/VRR.

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Jalati
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Using Apple TV+ app with HDR on movie mode and brightness abruptly drops. Restarting the content works but annoying. Q95t 75” latest firmware. 

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Luke_H
Explorer
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I'm also experiencing the same issue. Currently running between Sky Q and a Xbox one X. 
It's noticeable across all content. Sky, Xbox, Netflix via Xbox app. As I type this it's happened once, and twice since researching this a little. 


currently running the latest firmware. Surely there's some support here for this issue?? Clearly somethings going on and this fix on entering the service menu seems a huge inconvience!!! 

 

Help please Samsung!!!!

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jayh89
Helping Hand
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Did you ever fix this? I am having a similar issue.
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Luke_H
Explorer
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Unfortunatley not. Having the same issue consistantly. Happens daily and is incredibly frustrating given the cost of the TV.

 

Any help from someone in support???????

SexChromo
First Poster
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OK so not 100% sure  This will solve the issue you guys are having with HDR and game mode but I am having the same issue with watching Blu-Ray disks on my xbox. The screen would automatically dim after about a minute of resetting the brightness to a higher level.   The fix that I found is to adjust the Eco solution setting which to save energy automatically dims the screen when ambient light in the Room is detected below a certain level. 

 

Go to: menu/settings/general/Eco solution and you should be able to adjust those settings accordingly.

 

This has worked for me but  I haven't tested while actually playing a game.

jayh89
Helping Hand
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Yeh I've tried that. It's something to do with local dimming with HDR sources. Wish Samsung could help! 

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SexChromo
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Ah, I see
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