This is what I did for the workaround:
boot.kernelParams = [
"amd_iommu=on"
"iommu=pt"
"kvm_amd.npt=1"
"kvm_amd.avic=1"
"quiet"
"splash"
"microcode.amd_sha_check=off"
"amdgpu.ppfeaturemask=0xfffdffff" # turned off Stutter Mode
"amd_pstate=disable" # also disabled AMD's pstate
];
# set the performance to manual after boot
systemd.services.set-amd-power-settings = {
enable = true;
description = "Set AMD GPU power settings";
wantedBy = [ "sysinit.target" ];
serviceConfig = {
Type = "oneshot";
ExecStart = pkgs.writeShellScript "set-amd-power" ''
echo "manual" > /sys/class/drm/card1/device/power_dpm_force_performance_level
echo "1" > /sys/class/drm/card1/device/pp_power_profile_mode
'';
};
};