NixOS Lenovo ideapad s540 nvidia GTX1650 powersave

README.md

Welcome ideapad s540 GTX1650 Nix-friends (good news ahead)

I've spend way too long to get the NVIDIA-driver to work, as well as taming the overheating problem which has haunted my ideapad forever. I hope this config can save somebody else lots of time (please comment!), as I experienced weird catch22 scenarios because of the dual-video driver.

note: if you laptop still overheats, lower the CPU_SCALING_MAX_FREQ variables.

You can now run apps on the NVIDIA GPU by creating this nvidia-run shellscript-wrapper:

#!/bin/sh
export __NV_PRIME_RENDER_OFFLOAD=1
export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
export __GLX_VENDOR_LIBRARY_NAME=nvidia
export __VK_LAYER_NV_optimus=NVIDIA_only
exec "$@"

Demo:

$ nix-shell -p glxinfo --run glxinfo| grep 'OpenGL vendor'
OpenGL vendor string: Intel

$ ./nvidia-run nix-shell -p glxinfo --run glxinfo| grep 'OpenGL vendor'
OpenGL vendor string: NVIDIA Corporation

configuration.nix

{ config, pkgs, ... }:

{
  imports =
    [ 
      /path/to/hardware-configuration.nix
    ];
    
  # all your other stuff
}

hardware-configuration.nix

{ config, lib, pkgs, modulesPath, ... }:

{

  imports =
    [ 
      (modulesPath + "/installer/scan/not-detected.nix")
      ./nvidia.nix
    ];

  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "nvme" "usbhid" "usb_storage" "sd_mod" "rtsx_pci_sdmmc" ];
  boot.initrd.kernelModules = [ ];
  boot.kernelModules = [ "kvm-intel" "fuse" ];
  boot.extraModulePackages = [ ];

  fileSystems."/" =
    { device = "/dev/disk/by-label/nixos";
      fsType = "ext4";
    };

  swapDevices = [ { device = "/dev/disk/by-label/swap" ; } ];

  #networking.hostName = "ideapad";

  # Enables DHCP on each ethernet and wireless interface. In case of scripted networking
  # (the default) this is the recommended approach. When using systemd-networkd it's
  # still possible to use this option, but it's recommended to use it in conjunction
  # with explicit per-interface declarations with `networking.interfaces.<interface>.useDHCP`.
  networking.useDHCP = lib.mkDefault true;
  # networking.interfaces.wlp0s20f3.useDHCP = lib.mkDefault true;

  nixpkgs.hostPlatform = lib.mkDefault "x86_64-linux";
  powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
  hardware.cpu.intel.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;

  # pinned kernel version, change with commented latest version if needed 
  boot.kernelPackages = pkgs.linuxPackages_6_1; # pkgs.linuxPackages_latest;
  boot.kernelParams = ["intel_pstate=disable"];

  # prevent overheating
  services.tlp = {
  #config.services.tlp.settings = {
    enable = true;
    extraConfig = ''
      START_CHARGE_THRESH_BAT0=75
      STOP_CHARGE_THRESH_BAT0=80

      #CPU_SCALING_GOVERNOR_ON_AC=schedutil
      #CPU_SCALING_GOVERNOR_ON_BAT=schedutil

      ## ideapad s540: scaling_available_frequencies = 2001000 2000000 1900000 1800000 1700000 1500000 1400000 1300000 1200000 1100000 1000000 800000 700000 600000 500000 400000 [kHz]
      #CPU_SCALING_MIN_FREQ_ON_AC=400000   # see tlp-stat -p for min/max
      #CPU_SCALING_MAX_FREQ_ON_AC=1900000
      #CPU_SCALING_MIN_FREQ_ON_BAT=400000
      #CPU_SCALING_MAX_FREQ_ON_BAT=1900000

      CPU_SCALING_GOVERNOR_ON_AC = "performance";
      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";

      CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
      CPU_ENERGY_PERF_POLICY_ON_AC = "performance";

      CPU_MIN_PERF_ON_AC = 0;
      CPU_MAX_PERF_ON_AC = 100;
      CPU_MIN_PERF_ON_BAT = 0;
      CPU_MAX_PERF_ON_BAT = 20; 

      # uncomment this to always run in battery mode (when laptop keeps runing too hot in AC mode)
      #TLP_DEFAULT_MODE = "BAT";
      #TLP_PERSISTENT_DEFAULT = 1;

      # Enable audio power saving for Intel HDA, AC97 devices (timeout in secs).
      # A value of 0 disables, >=1 enables power saving (recommended: 1).
      # Default: 0 (AC), 1 (BAT)
      SOUND_POWER_SAVE_ON_AC=0
      SOUND_POWER_SAVE_ON_BAT=1

      # Runtime Power Management for PCI(e) bus devices: on=disable, auto=enable.
      # Default: on (AC), auto (BAT)
      #RUNTIME_PM_ON_AC=on
      #RUNTIME_PM_ON_BAT=auto

      # Battery feature drivers: 0=disable, 1=enable
      # Default: 1 (all)
      NATACPI_ENABLE=1
      TPACPI_ENABLE=1
      TPSMAPI_ENABLE=1
    '';
  };

}

nvidia.nix

{ pkgs, ... }:
{
  nixpkgs.config.allowUnfree = true;

  ## Make sure opengl is enabled
  hardware.opengl = {
    enable = true;
    driSupport = true;
    driSupport32Bit = true;
  };

  ## Tell Xorg to use the nvidia driver (also valid for Wayland)
  services.xserver.videoDrivers = ["nvidia"];
  hardware.nvidia.prime = {
    offload = {
      enable = true;
      enableOffloadCmd = true;
    };
    sync.enable = false;
    # Bus ID of the Intel GPU. You can find it using lspci, either under 3D or VGA
    intelBusId = "PCI:0:02:0";
    # Bus ID of the NVIDIA GPU. You can find it using lspci, either under 3D or VGA
    nvidiaBusId = "PCI:2:00:0";
  };

  hardware.nvidia = {
    ## Modesetting is needed for most Wayland compositors
    modesetting.enable = true;
    # Use the open source version of the kernel module
    # Only available on driver 515.43.04+
    open = false;
    # Enable the nvidia settings menu
    nvidiaSettings = true;
    package = pkgs.linuxPackages.nvidia_x11;
  };
}