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Weird stutter when enabling G-Sync Compatible

Discussion in 'Videocards - NVIDIA GeForce Drivers Section' started by Vyre, Jan 18, 2019.

  1. Vyre

    Vyre New Member

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    GPU:
    1080TI
    Hello,
    If this is wrong place to ask this, sorry, please move it somewhere more appropriate.
    Also I didn't expect G-Sync to work without a problem on uncertifed monitor but this is really weird and I don't think its monitor that is at fault here.

    So basically after enabling G-Sync in Nvidia Control Panel I launched BFV and was greeted with this. Not a pretty sight. After enabling various stuff in BFV, multiple restarts, god know what else (but i didnt set it to dx12, this will be important later) it somehow stopped doing that. Overjoyed I played for an hour or two and then i slept my PC and went to do something else. When i came back and launched BFV, the issue came back.
    I was annoyed so I started digging deeper. I downloaded program to test freesync/gsync called Refresh2025 and while i was using it I noticed that this issue only happens on DX11 and Vulkan and not on DX12.

    DX11
    DX12
    Vulkan

    My monitor : 27'' LG 27UD58-W

    If you have any troubleshooting tips or know what's going on here, kindly share. I'm out of my mind here.

    EDIT: After DDU-ing and installing "clean" driver issue persists.

    EDIT2: For anyone experiencing this problem, simply poweroff and poweron your monitor while your pc is running, it will fix it.
     
    Last edited: Jan 18, 2019
  2. gerardfraser

    gerardfraser Ancient Guru

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    GPU:
    R9 290 Crossfire
    My Monitor same panel you have.I know what this is and here is the fix.
    Change resolution to some different in Nvidia control panel run Nvidia Pendulum Demo if you want to check it out and switch back to Native 3840 x 2160.Boom.
    If you get the weird crap in game do the same change resolution. You will have to do it every restart for me I only restart my computer when testing overclocks.

    Also I changed freesync range with CRU 33-61 and tested from 30-40 FPS in Nvidia Pendulum Demo video below.If you use after burner you can turn on frametimes and see how smooth the adaptive/freesync/gsync is.

    LG 27" 4K UHD 5ms GTG IPS LED FreeSync Gaming Monitor (27UD59P-B.AUS) - Black



    Shadow Of The Tomb Raider 4K Ultra SMAAT2X with FPS 35-45 and smooth.
     
    Last edited: Jan 18, 2019
  3. skacikpl

    skacikpl Member Guru

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    GPU:
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    I get similar effect every time i reboot the PC after enabling G-sync.
    In my case manually powering the monitor off and on (while PC is running) fixes it.
    It's not a long term solution but since something as trivial seems to solve it, i would guess it might be solved driver side eventually.
     
    fluidz likes this.
  4. gerardfraser

    gerardfraser Ancient Guru

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    Yes I agree will be fixed ,turning the monitor on/off is even a lot faster.I think i will just do this.Thanks
     
    toyo likes this.

  5. Vyre

    Vyre New Member

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    Thanks for the fix! It works great.
    (A tak btw to wszędzie cię widzę. Pewnie dlatego że mamy podobne zainteresowania lol)

    Thanks for the initial fix but I guess the one that SkacikPL posted is kinda easier to do.
     
    skacikpl likes this.
  6. gerardfraser

    gerardfraser Ancient Guru

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    Way easier to do,I will be just turning it on /off for a couple days until hot fix is released.
     
  7. Warkratos

    Warkratos Active Member

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    Same issue here, with an LG 29UM68-P, this monitor works at 75Hz with freesync, but when I keep my monitor idling (or reboot my PC) for some minutes it begins to skip frames (test with UFOTest https://www.testufo.com/frameskipping) and causing some stutters. Works fine at 60hz.

    My workaround is to go to the monitor OSD config and set the "Ratio" to "Original" then back to "Wide". fixes my issue until they release new drivers.

    I have submitted an report using this link too: https://surveys.nvidia.com/index.jsp?pi=c7e1841997b517fad69d16106b36250b
     
  8. Vlooi

    Vlooi Member

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    For Samsung U28E590D owners power on off does not work. Just toggle your input selector on the OSD to HDMI1 and back (or any other source for that matter). It will work perfectly then.
     
  9. Erick

    Erick Member

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    It appears to be a pixel clock and vertical range issue with the G-Sync compatible monitors or...rather FreeSync monitors and DisplayPort issues that we never knew about. It seems to actually scan all vertical and horizontal ranges correctly. I changed my Samsung monitor's vertical minimum range to the default (per the manual) 56hz - 72hz and G-Sync stopped scanning. I then set the minimum back to 48hz and G-Sync was working again. If you can get your minimum vertical range to go lower then it's better, however, you may run into some flashing and black screen issues with gaming.

    The good thing about G-Sync is that it shows if an area of the game causes frames to dip. V-Sync probably locked the refresh to mask those problems whereas G-Sync revealed more problems to the naked eye; we may say that the game might really be broken if it stutters.

    So if it stutters and you have G-Sync compatible enabled, then I agree and it's a problem.
     
    Last edited: Jan 20, 2019
  10. PeskyPotato

    PeskyPotato New Member

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    Just want to say, I have an AW2518H, and have similar issues.

    Even with just regular refresh rate on, rather the G-Sync it is capable of, sometimes the edges of my screen glitch out or get weird opaque/brokenness. Sometimes with a line of the same issue down the center of the screen, but sometimes just on the edges... and even if there isn't any of this more obvious type of issue going on with the monitor, I get some stuttering at times even when my FPS is great & above the 240hz I have.

    In all cases, I've been learning over the months that as gerardfaser said above, changing the resolution or refresh rate of the monitor in the Nvidia Control Panel... then switching it back to the 240hz @ 1920x1080... fixes the issues.

    It's interesting to hear that powering the monitor off and back on while the computer has loaded windows already may help just as much, since it seems like it'll be a lot faster to fix now. Honestly, I'll probably just start turning my monitor off & back on everytime I load up Windows and open a game to play, just to be safe.

    It's probably some issue with G-Sync capable monitors, since I never had as many issues like this with my old Acer 120hz, non G-Sync or Freesync & non ULMB capable monitor. It used DVI cables though, so I guess it could also just be a Display Port thing too?

    Either way, while in some ways I'm very impressed with how 240hz feels compared to 120hz, I guess I've basically found ULMB and G-Sync to be kind of useless for FPS gaming due to the input lag introduced... and when you add in the fact that it can be difficult or impossible to get 300FPS+ constant/stable in a lot of games, it kind of makes me question if the pricetag for this monitor was really worth it overall. These issues and bugs really, really don't help either :/
     

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