LG 27GP850-B - Backlight flicker

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Joined
31 Dec 2013
Posts
245
Location
Kent
Hello all,

I’ve been using the above monitor since I purchased it from here roughly 2 weeks ago.

I had no issues and assumed that HDR was already active “out of the box” until yesterday evening when I looked in to my display settings and had a fiddle with the monitors settings.

I’ve turned HDR on now but am experiencing a sporadic screen flicker (mainly in games but occasionally on the desktop and in Adobe Premier) - a seemingly constant adjustment between two very similar levels of brightness with the occasional 1-frame black bar flashing horizontally across the top of the monitor. The problem seemed to persist with HDR turned off yesterday but now I can’t seem to replicate that specific issue.

My settings are:
(Windows)
Windows 10
HDR - On
Hardware Accelerate GPU Schedule - Off
Variable Refresh Rate - Off
Windows Updates - Up to date

(Nvidia Control Panel)
Driver - 496.76 (latest as of 21/11)
Enable G-Sync - On
G-Sync Mode - Full Screen only
*does it matter that this is on as I’m using LG’s adaptive sync, should I turn it off and/or should I consider the G-Sync ‘Full Screen and Windowed Mode?*

(Monitor)
Overclock - No (165Hz)
Adaptive Sync - Extended
Response Time - Fast
Variable Backlight Speed - Fast (Default)
Motion Blur Reduction - Off
DisplayPort - 1.4
Smart Energy Saving - ‘Greyed’ out/unavailable

I think the issue may be a conflict between HDR and Variable Backlight Speed, I have turned it off and the issue seemed intermittent still but I haven’t had the time today to test it further. What’s peoples opinions on the ‘Variable Backlight Speed’ feature?

Often the desktop will be flickering until I load an application or open a webpage and so far, the problem continually persists in games.

Has anyone had a similar issue or have any idea how to stop the flickering effect? Unfortunately it’s really hard to capture the issue in a photo so I apologise for not including an example.

I would appreciate any suggestions!

Thanks,
Joe
 
Last edited:
So I think that the issue is with Nvidia drivers, I have the same issue I have tried everything even a new displayport cable.
I checked reddit and some people were talking about it also it seems that the problem is with drivers further ahead than the version 472.12.
I have a 3070 and the same monitor if it helps. Maybe some bug between this displays and this graphics card?
 
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