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Original topic:

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

(Topic created on: 07-12-2020 05:15 PM)
Rauttis
Explorer
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TV

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

1,968 REPLIES 1,968
Toejo78
Navigator
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TV

Yeah apparently each region has to do their own testing, EU unfortunately are usually useless. 4 to 6 weeks generally but we have Christmas in the way. The firmware is all written at the same time as well  If you look at the build date and time of the firmware.

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BogaMoge
Pathfinder
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TV

That's a bit disingenuous. We had some updates coming a few weeks after the US, but the last one (1403.1) took only days, so who knows what will happen this time.

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Toejo78
Navigator
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TV

It took two weeks last time, but let's hope they manage to get something out before Christmas.

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jayh89
Helping Hand
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TV

I'm in Scotland and got the update via my TV's "check for update" button. So, I guess it's being rolled out slowly :smiling-face:

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SidL
Pathfinder
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TV

I upgraded to the latest version available to me (1461) and nothing to fix the local dimming with GMP OFF!! 😤😡

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GD_UK_2020
First Poster
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TV

hmm interesting, guess it's model specific. I'm in the UK but nothing for my QLED 2020 43" yet.

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Toejo78
Navigator
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TV

It's on the website for the q90t nothing for the q95 yet.

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Xxspawnxx
Pioneer
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TV

If you got the new firmware then please Tell us about ghosting, gaming with 4k 120hz VRR and Gamemode Pictures quality  generally.

And If you See scanlines or Something. Because that are the issues Most people have

Charlyiii
Student
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TV

I am in Spain with a Q82T. When i come Back home, i Will look.

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GD_UK_2020
First Poster
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TV

Firmware 1460.9 is available from the UK support site now for QLED 2020 TVs

  • ver 1460.9
  • 1603.25 MB
  • Dec 08. 2020
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