I don't know if that DWORD is deprecated, but I tried here, and it didn't work. PresentMon is still showing lower fps on idle, just like op.
Any other clues?
I was able to record a 30minute segment that shows the stuttering happening in 10minute intervals.
https://www.youtube.com/watch?v=Id83HK22ksw
Elgato capture card was set as the only output, just to make sure cloning wasn't the culprit. It is set to 4k 60fps, so is OBS. It is in the correct pcie ...
Hey! Sorry for taking so long to reply, a lot of things happened since then.
I found out, by chance, that when you are using cloned display mode, and change the refresh rate of a display (on the settings page), windows prioritizes that recently altered display as the master.
I have an Alienware AW2725DF, which uses DSC (Display Stream Compression) over DisplayPort, but not via HDMI. Over DisplayPort it can reach 1440p 360hz, on HDMI it only reaches 144hz.
When I plug it in via DP, Special K shows no MPO support (only 1 plane). Plugging it in via HDMI shows MPO support ...
I'm coming from a BenQ XL2430T to this monitor, and I really do miss the sharpness setting (0-10). Vividpixel 25 looks like sharpness 5, but vividpixel 50 looks like sharpness 10. Vividpixel 75 and 100 are completely unusable. Does anyone have a clue if it's possible to modify the OSD configuration ...