Public bug reported:

GPU=Rx vega m gl 
Release=Focal, 20.04 (development)
xserver-xorg-video-amdgpu version=19.1.0-1 (active development)

The expected outcome of altering the file, pp_od_clk_voltage, p-states cannot 
be changed using echo commands i.e. 
echo "s 3 700 700" > /sys/class/drm/card1/device/pp_od_clk_voltage
Various variations of the above have been tried, including using sudo su and 
checking file write permissions.

The file power_dpm_force_performance_level could be changed only within sudo su 
when DRI_PRIME=1 was used to open a program in the background i.e. DRI_PRIME=1 
steam:
sudo su
echo "manual" > /sys/class/drm/card1/device/power_dpm_force_performance_level

Following this, pp_od_clk_voltage could still not be changed.

A similar bug was found here; 
https://gitlab.freedesktop.org/drm/amd/issues/574
However, I was not able to amend any P-states as described in the bug described 
in this link. 

The voltages and clock speeds cannot be amended.

** Affects: xserver-xorg-video-amdgpu (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1861633

Title:
  Rx vega m gl undervolt and overclock pp_od_clk_voltage values cannot
  be changed using echo

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