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I use a laptop with Nvidia Optimus, and I'm running the newest Void Linux. Following instructions on its wiki and the Arch wiki, I got the desktop able to render via the GPU rather than the iGPU or CPU.

The problem is that it seems to have configured my default refresh rate wrong, here is xrandr:

 Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
HDMI-0 disconnected (normal left inverted right x axis y axis)
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
 1920x1080 60.06 + 60.01 59.97 59.96* 59.93 40.04 
 1680x1050 59.95 59.88 
 1400x1050 59.98 
 1600x900 59.99 59.94 59.95 59.82 
 1280x1024 60.02 
 1400x900 59.96 59.88 
 1280x960 60.00 
 1440x810 60.00 59.97 
 1368x768 59.88 59.85 
 1280x800 59.99 59.97 59.81 59.91 
 1280x720 60.00 59.99 59.86 59.74 
 1024x768 60.04 60.00 
 960x720 60.00 
 928x696 60.05 
 896x672 60.01 
 1024x576 59.95 59.96 59.90 59.82 
 960x600 59.93 60.00 
 960x540 59.96 59.99 59.63 59.82 
 800x600 60.00 60.32 56.25 
 840x525 60.01 59.88 
 864x486 59.92 59.57 
 700x525 59.98 
 800x450 59.95 59.82 
 640x512 60.02 
 700x450 59.96 59.88 
 640x480 60.00 59.94 
 720x405 59.51 58.99 
 684x384 59.88 59.85 
 640x400 59.88 59.98 
 640x360 59.86 59.83 59.84 59.32 
 512x384 60.00 
 512x288 60.00 59.92 
 480x270 59.63 59.82 
 400x300 60.32 56.34 
 432x243 59.92 59.57 
 320x240 60.05 
 360x202 59.51 59.13 
 320x180 59.84 59.32 
HDMI-1-2 disconnected (normal left inverted right x axis y axis)

I can force "59.96" which mostly fixes the stuttering, with rare-ish exemptions, but the problem then is that some applications that love the defaults, like Overgrowth (some combat game from Steam), so it stutters like crazy due to that "60.06Hz" nonsense (EDIT2: found a fix by having the game run in a window and rebooting with edited monitor.xml settings [might not be needed] and forced xrandr refresh rate to 59.96Hz. Doesn't allow me to use fullscreen though which is annoying) (EDIT4: Can run the game in fullscreen now, but only in MATE when using Marco compositor and doing borderless window, still a bit inconvienent if I wanted to use KDE [my main GUI] or another non-i3 interface). I tried Arch's EDID fix, doesn't work. I tried forcing a framerate with a modeline from cvt, doesn't work. I hope changing monitors.xml will work, or I'll tear my head off. It might not though since "60" just makes things "60.06," causing horrible stuttering. I don't know how to fully fix this or even have all applications just use the more sensible 59.96Hz to satisfy the display. Is there any way to fix this?

EDIT: I'm also looking for a solution for even the slight stutter from using 59.96Hz, as it can still be somewhat annoying for obsessive types like me.

EDIT3: To make matters worse, it seems in display settings of both MATE and KDE, they think I can use 120Hz. That's how misconfigured the display is.

EDIT5: Monitors.xml does nothing.