G-Sync compatible display flickering with Nvidia GPU

[Dudi4PoLFr]

Hi guys,

 

I got a new display (Asus PG43UQ) which is a G-Sync compatible, used with a 2080Ti (driver up to date + even DDU with clean install to be sure, multiple DP cables tested). Everything works fine at 4K@144Hz+DSC+10bit (HDR OFF because of Windows support...) but for some reason I'm getting a lot of flickering in some very specific cases.

 

I have found some similar problems with different screens but in all cases it was with Freesync display (yes I know it's the same as G-SC) and AMD GPU so I can't not use the given solutions.

 

For example when Handbreak is opened the image on the whole display look compressed and when I hover on a menu or a button the whole screen is flickering like crazy. Same thing is happening when the Microsoft Store Messenger app or Tarkov launcher is on the screen (even without any interaction, just when the window is in focus), also in some games when I'm in a menu.

 

With the onscreen tool that can monitor the refresh rate I noticed that when the screen is flickering the refresh is not stable at 144Hz but all over the place from 40 to 90.

 

When the G-Sync is disabled in the screen menu, I don't have any problems.

 

Some of you had a similar issue?

 

Thank you in advance.

 

[JoostinOnline]

My guess is that it's having trouble keeping in sync with the apps you're using.  I've got two possible solutions.

1. Try disabling hardware acceleration in Windows apps.  This may result in performance loss for Windows apps.
2. Open Nvidia Control Panel and set G-Sync to only work in Fullscreen apps (not Windowed).  This means no running games in Borderless Windowed mode if you want G-Sync though.

[Dudi4PoLFr]

1 hour ago, JoostinOnline said:

My guess is that it's having trouble keeping in sync with the apps you're using.  I've got two possible solutions.

1. Try disabling hardware acceleration in Windows apps.  This may result in performance loss for Windows apps.
2. Open Nvidia Control Panel and set G-Sync to only work in Fullscreen apps (not Windowed).  This means no running games in Borderless Windowed mode if you want G-Sync though.

Thank you for the replay.

 

So, 1 is off by default in W10 2004 so I turned in On might help or nope. 2. With 3 screens this one will be quite painful, I'm trying it right now.

 

Well from what I could test, with GS in full screen only mode there is no more problems on the desktop but full screen games are still flickering like crazy and the refresh is jumping everywhere between 40 and 110. I'm wondering if this is a driver bug.

 

Edit 2:

I'm might find the problem but it's not on Asus website but on tomshardware review: 3840x2160 @ 144Hz; G-Sync Compatible: 48-120 Hz; FreeSync: 30-144 Hz 

 

And effectively limiting my refresh at 120Hz solved my problem, so I need to chose between full 144Hz refresh or 120Hz + G-SC. But still I would like to know why the FS has way bigger range.

[JoostinOnline]

17 hours ago, Dudi4PoLFr said:

And effectively limiting my refresh at 120Hz solved my problem, so I need to chose between full 144Hz refresh or 120Hz + G-SC. But still I would like to know why the FS has way bigger range.

Likely because getting G-Sync certification is a lot more difficult than getting FreeSync certification.  It probably also happens when using G-Sync, but nobody cared.

 

Honestly it's not like it really matters.  You were never going to be able to run anything at 4K@144fps.  No GPU exists or will exist for many years that is capable of that.  The only things you could run at 4K@144hz (or even 120hz) aren't even going to benefit from the higher resolution, because there isn't enough detail.