https://www.rtings.com/tv/reviews/sony/x95j
through a displayport (version?) to hdmi 2.1 adapter, there's no option for 4k@120fps
DisplayPort-1 connected (normal left inverted right x axis y axis)
3840x2160 60.00 + 50.00 59.94 30.00 25.00 24.00 29.97 23.98
4096x2160 60.00 50.00 59.94 24.00 23.98
1920x1200 60.00
1920x1080 120.00 100.00 119.88 60.00 50.00 59.94 30.00 24.00 29.97 23.98
1600x1200 60.00
1680x1050 59.88
1600x900 60.00
1280x1024 60.02
1440x900 60.00
1280x800 60.00
1152x864 75.00
1280x720 60.00 50.00 30.00 59.94 29.97 24.00 23.98
1024x768 60.00
800x600 60.32
720x576 50.00
720x480 60.00 59.94
640x480 60.00 59.94
configured manually
$ xrandr --newmode "3840x2160_120" 1188.00 3840 4016 4104 4400 2160 2168 2178 2250 +hsync +vsync
$ xrandr --addmode DisplayPort-1 3840x2160_120
$ xrandr --output DisplayPort-1 --mode 3840x2160_120 --set TearFree on
i got these values from the edid of a monitor i happened to have. still unsure if/how i was supposed to calculate them without it, or if this setting is either harmful to my tv or lacking in some capacity.
(TODO: post edid txt of tv, monitor. explain further)