I have a bit of a problem that I’m struggling to get to the bottom of, I have a GTX 980 which I’m using for a home cinema/gaming setup hooked up through a receiver and then into an LG OLED65B6V, before that I was using a Samsung UE55JS9000 which presented with the same problem. I’m running Debian on this set up with the 367.44 Nvidia drivers.
If I run my display at 1920x1080 @ 60Hz everything is fine, it’s all smooth and I don’t get any problems, however as soon as I switch to 3840x2160 @ 60Hz I get this problem. The only way I can describe it is that it isn’t smooth, actions seem juddery and even scrolling menus in Kodi seems to cause stuttering. When I say juddery I don’t mean like it is at 30Hz it just seems sort of irregular, frames seem to skip.
Oddly if I run it at 3840x2160 @ 30Hz it’s obviously lower FPS but it doesn’t skip.
It’s important to note this seems to be all the time, whether I’m playing a video or rendering 3D doesn’t seem to matter.
Now obviously this is hard for me to demonstrate via video but here are a couple of comparisons between 4k/1080p:
I’ve tried taking the receiver out of the loop, that’s not the source of the problem. So I’m struggling where to look now!
Does anyone have any ideas?