Well, I'll be damned! such a simple trick required to successfully create the custom resolutions. just confirmed to be working!fenderjaguar wrote:if you're creating a 60hz downsampled res, then make sure your running in 1920x1080 60hz mode when creating it.
It's strange that you can get this to work properly and I can't. What GPU, OS and driver are you using?applejack wrote:I setup all custom resolutions using auto timings, and have no problem adding 3840x2160 @ 60hz.
Yes, basically exactly my experience too.applejack wrote:anyway, I tested some games and unfortunately both 3200x1800@60hz and 3840x2160@60hz flickers in G-Sync (black screen for fraction of a second) in many games. some flickers once every minute or so, others flickers constantly / very badly.
I am not sure why, but its definitely related to downampling @ 60hz with G-Sync.
it also flickers in all other custom res if set at 60hz, but never seen it flicker at higher refresh rates (85/100/120/144).
it never flickers with just V-Sync On/Off (1800p and 2160p @ 60hz works great without G-Sync).
flickering can be greatly reduced or completely eliminated @ 60hz with G-Sync by capping fps at several frames lower than 60.
Yes, I have this happening to me as well.applejack wrote:however, I stumble into another issue now, which is fortunately manageable.
I only tested a couple of games and it appears that when switching from a G-Sync 60hz downsampled resolution (say 3840x2160 or 3200x1800) straight to native 1080p @ 144hz G-Sync mode (in-game) OR normal mode (exit to desktop), monitor sometimes lose signal, going completely black, requiring a hard reset (system feels freeze in this state).
playing around with it some more I find two options to overcome this:
1. gradually lower resolution (increase refresh rate) in-game, say from 2160p@60hz to 1620p@85hz so only afterwards I may exit to desktop or go 1080p@144hz in-game. (note that I use "preferred refresh rate: maximum available" set globally in NVCP).
2. set desktop refresh rate to 60hz before launching a game set to 2160p or 1800p @ 60hz so it won't freeze when exiting back to desktop.
there might be other ways to go around it as I haven't tested thoroughly. anyway the above methods makes those ultra downsampling resolutions + g-sync usable at last, considering your hardware can push it
nevertheless, hope this new quirk get sorted out as well with future drivers.
That's only useful when the internal resolution is an exact multiple, like 3840x2160 in a 1920x1080 monitor. At less resolution, like downsampling from 1440p, some pixels are missed (it's like nearest neighbor filtering, aka no filtering). You can see it if you move a window with text of 1px of thickness, like the options menu of HL2.fenderjaguar wrote:Definitely set "smoothness" to 0% though. Have fun.
