Can't choose 120hz refresh rate in 4K on Orange Pi 5b. Able to with other distros

[Aaron Smith]

When using Armbian on my Orange Pi 5b, I can't select 120hz when the resolution is 4k but I can when it's set to 1080p. In other distros like Joshua Riek's Ubuntu and the official Orange Pi 5 Ubuntu release, 120 hz is selectable in 4k and works wonderfully. Is there something I'm missing somewhere? Is there something I can do to manually enable this somewhere? This distro checks all the boxes for me otherwise. Using 120 hz makes a massive difference when streaming games from my desktop to my living room TV using Sunshine/Moonlight.

[Igor]

11 hours ago, Aaron Smith said:

When using Armbian

Nobody knows what you are running. 

All those images uses Armbian kernel, so its either you are using a bit older version or there is some user space settings, hack or parameter that makes this diff.