To enable AMD GPU voltage manipulation kernel parameter must be added, please do one of the following:

* In GRUB add to "GRUB_CMDLINE_LINUX_DEFAULT" following text "amdgpu.ppfeaturemask=0xffffffff", example:

    GRUB_CMDLINE_LINUX_DEFAULT="loglevel=3 cryptdevice=/dev/nvme0n1p3:cryptroot amdgpu.ppfeaturemask=0xffffffff psi=1"

  Easiest way is to modify "/etc/default/grub" and generate new grub config.

* If you have hooks enabled add in "/etc/modprobe.d/amdgpu.conf" to "options" following text "amdgpu.ppfeaturemask=0xffffffff", example:

    options amdgpu si_support=1 cik_support=1 vm_fragment_size=9 audio=0 dc=0 aspm=0 ppfeaturemask=0xffffffff

    (only "ppfeaturemask=0xffffffff" is required and if you don't have "options amdgpu" you can just add "options amdgpu ppfeaturemask=0xffffffff")