how to get xrandr to work with nvidia 1080 8gb

[magick]

how do i get nvida to work with xrandr to overclock my tv to 120fps
this is what i get when i try to add the 120fps mode


X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 43
Current serial number in output stream: 44


when i was on windows 11 i could do this easily with custom resolution utility but on kubuntu, xrandr dosent work properly

[claydoh]

Kubuntu version?

Monitor model?

Which Nvidia driver?

x11 or Wayland (will assume x11)?

What was the exact, precise command used to determine the correct modeline, and the exact, precise command you used to try and enable it?