Can't get 4k @ 60 hz with nouveau Open Source but NVIDIA "unfree" driver works

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Using the nouveau freedom driver xrandr lists 4k @ 30hz as maximum compatible resolution on DisplayPort.

With NVIDIA "proprietary" driver it magically does 4k @ 60hz out of the box, no config needed.

Tried forcing custom resolution:

$ xrandr --addmode DP-0 "3840x2160_60.00"
$ xrandr --output DP-0 --mode "3840x2160_60.00"
# monitor throws "No Signal"

Nouveau does work on HDMI @ 4k 60 but not DisplayPort.

Is DP 1.2 specification a limit of nouveau forcing users to unfree for using DP 1.4 on NVIDIA cards? Or is there a known workaround for 4k60 on DP?


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