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nixpkgs/nixos/modules/services/hardware/amd-hybrid-graphics.nix

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Nix

{ config, pkgs, lib, ... }:
{
###### interface
options = {
hardware.amdHybridGraphics.disable = lib.mkOption {
default = false;
type = lib.types.bool;
description = ''
Completely disable the AMD graphics card and use the
integrated graphics processor instead.
'';
};
};
###### implementation
config = lib.mkIf config.hardware.amdHybridGraphics.disable {
systemd.services."amd-hybrid-graphics" = {
path = [ pkgs.bash ];
description = "Disable AMD Card";
after = [ "sys-kernel-debug.mount" ];
requires = [ "sys-kernel-debug.mount" ];
wantedBy = [ "multi-user.target" ];
serviceConfig = {
Type = "oneshot";
RemainAfterExit = true;
ExecStart = "${pkgs.bash}/bin/sh -c 'echo -e \"IGD\\nOFF\" > /sys/kernel/debug/vgaswitcheroo/switch; exit 0'";
ExecStop = "${pkgs.bash}/bin/sh -c 'echo ON >/sys/kernel/debug/vgaswitcheroo/switch; exit 0'";
};
};
};
}