Custom Resolution Utility (CRU)

[Dreamic]

(09-07-2022 12:03 AM)mdrejhon Wrote:  

(09-02-2022 06:24 AM)Dreamic Wrote:  Stock LFC being as high as 80Hz is rare, almost everything else is a good bit lower.

(09-03-2022 03:21 AM)Dreamic Wrote:  There is nothing worse about this monitor below 80Hz. Flickering also does not begin until about 35Hz, which would require setting a limit of 25Hz~, as LFC kicks in roughly 10Hz/fps above. Nobody plays or wants to play games at this low framerate anyway.

LFC flicker is caused by pixel decay on the LCD, since a pixel fades to its rest state when not refreshed for too long.

Different panels have fast-fade behavior and others slower-fade.

That's why I recommend to many people to manually edit min Hz to a higher number to prevent display flicker -- but not all displays require that. LFC stutter penalty is linked to max Hz, so it is extremely minor when the VRR range is wide (e.g. 240Hz).

For example, compare a 120Hz FreeSync monitor to a 280Hz FreeSync monitor -- a 0.5/280sec error margin (stutter) is extremely invisible compared to a 0.5/120sec error margin. So the higher your max Hz, I recommend a higher min Hz as long as (min,max) is about 3x or thereabouts.

LFC is a software-based mechanism (driver-initiated refresh cycles) in generic VRR implementations. Also, NVIDIA drivers (in G-SYNC Comaptible mode) sometimes override the LFC min-Hz and arbitrarily choose a higher LFC min Hz, at least in a 'sticky' manner. So if framerate falls a lot to trigger LFC, framerates need to rise a lot before LFC automatically disables. AMD drivers have a different LFC-stickiness/stiction algorithm.

You can watch this via the monitor's OSD framerate counter (more accurately refresh cycle counter), since this number will suddenly double or triple when LFC is initiated, so real GPU 35fps would read as 70fps in the monitor's framerate counter (which I prefer would have been named "refresh cycle counter") Try AMD, try NVIDIA, you'll see different LFC algorithms running.

I do watch Hz in OSD during Pendulum demo and 80-240Hz is jarring when brightness flickers/fluctuates from LFC engaging/disengaging.

So either I lower it so LFC never engages, or raise it (120Hz max) and cap FPS so it doesn't exceed/disengage LFC, which isn't ideal for all games.
Or I raise it and don't cap and deal with less worse brightness flicker/fluctuation from LFC.

I'd like to not deal with any brightness flicker/fluctuation.

This is the type of thing I'm talking about:
https://youtu.be/XDWOHT5qrI8
Dreadful.
Doesn't capture it perfectly but look at all the shadows and darkness in the background etc, the color tone/brightness of the sand etc I can also see change which maybe isn't picked up as well in this video.
No thank you.
It's like there's lightning going off behind the camera in the Pendulum demo.