here is my configuration.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # Laptop GPU using NVIDIA-PRIME
  services.xserver.videoDrivers = [ "nvidia" ];
  services.xserver.dpi = 100;
  hardware.nvidia.modesetting.enable = true;
  hardware.nvidia.prime = {
    sync.enable = true;

    # Bus ID of the NVIDIA GPU. You can find it using lspci, either under 3D or VGA
    nvidiaBusId = "PCI:1:0:0";

    # Bus ID of the Intel GPU. You can find it using lspci, either under 3D or VGA
    intelBusId = "PCI:0:2:0";
  };

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  # boot.loader.grub.efiSupport = true;
  # boot.loader.grub.efiInstallAsRemovable = true;
  # boot.loader.efi.efiSysMountPoint = "/boot/efi";
  # Define on which hard drive you want to install Grub.
  boot.loader.grub.device = "/dev/sda"; # or "nodev" for efi only

  networking.hostName = "nixos"; # Define your hostname.
  # networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.
  networking.networkmanager.enable = true;
  programs.nm-applet.enable = true;

  # Set your time zone.
  time.timeZone = "Asia/Jakarta";

  # The global useDHCP flag is deprecated, therefore explicitly set to false here.
  # Per-interface useDHCP will be mandatory in the future, so this generated config
  # replicates the default behaviour.
  networking.useDHCP = false;
  # networking.interfaces.enp0s3.useDHCP = true;

  # Configure network proxy if necessary
  # networking.proxy.default = "http://user:password@proxy:port/";
  # networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";

  # Select internationalisation properties.
  # i18n.defaultLocale = "en_US.UTF-8";
  # console = {
  #   font = "Lat2-Terminus16";
  #   keyMap = "us";
  # };

  # DE setup
  services.xserver = {
    enable = true;
    windowManager.i3 = {
        enable = true;
        package = pkgs.i3-gaps;
        extraPackages = with pkgs; [
            dmenu
            i3status
            i3lock
            volumeicon
            clipit
            xfce.xfce4-power-manager
            alacritty
            i3lock-fancy
            j4-dmenu-desktop
            xautolock
            playerctl
        ];
        configFile = "/etc/nixos/configs/i3-config";
    };
    desktopManager.xfce.enable = true;
    displayManager.lightdm.enable = true;
  };
  

  # Configure keymap in X11
  services.xserver.layout = "us";
  # services.xserver.xkbOptions = "eurosign:e";

  # Enable CUPS to print documents.
  # services.printing.enable = true;

  # Enable sound.
  sound.enable = true;
  hardware.pulseaudio.enable = true;

  # Enable proprietary stuff
  # Used for microsoft fonts and drivers
  nixpkgs.config.allowUnfree = true;

  # Enable fonts
  fonts.fonts = with pkgs; [
    noto-fonts
    noto-fonts-cjk
    noto-fonts-emoji
    liberation_ttf
    fira-code
    fira-code-symbols
    mplus-outline-fonts
    dina-font
    proggyfonts
    corefonts
    vistafonts
  ];

  # Enable touchpad support (enabled default in most desktopManager).
  # services.xserver.libinput.enable = true;

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.notroot = {
    isNormalUser = true;
    extraGroups = [ "wheel" "networkmanager" ]; # Enable ‘sudo’ for the user.
  };


  programs.steam.enable = true;
  environment.systemPackages = with pkgs; [
    wget vim
    procps
    polkit_gnome

    # User land stuff
    brave
    gparted
    xfce.mousepad
    xfce.terminal
    lxrandr
    libreoffice-fresh
    vscodium
    git
    dbeaver
    postman
    element-desktop
    discord
    megasync
    cherrytree
    htop
    p7zip
    mate.engrampa
    blender

    # To fix screen resolution and stuff
    arandr
  ];

  programs.bash.shellAliases = {
    mc = "source ${pkgs.mc}/libexec/mc/mc-wrapper.sh";
  };

  # List services that you want to enable:

  # polkit stuff
  security.polkit.enable = true;
  systemd.user.services.polkitGnome = {
    enable = true;
    description = "Gnome Polkit for sudo via GUI";
    wantedBy = [ "graphical-session.target" ];
    serviceConfig = {
      Type = "simple";
      ExecStart = ''${pkgs.polkit_gnome}/libexec/polkit-gnome-authentication-agent-1'';
    };
  };

  # Virtualization with podman (rootless docker)
  virtualisation = {
    podman = {
      enable = true;

      # Create a `docker` alias for podman, to use it as a drop-in replacement
      dockerCompat = true;
    };
  };

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  # networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "20.09"; # Did you read the comment?
}

and this is my channel

nixos https://nixos.org/channels/nixos-20.09
nixpkgs https://nixos.org/channels/nixpkgs-unstable

In reply to @jonringer:matrix.org
most likely, the channels haven't updated, eventually this should be remedied

so yeah, im going to use this for a while now...

NIXPKGS_ALLOW_UNFREE=1 NIX_PATH=nixpkgs=https://github.com/NixOS/nixpkgs/archive/refs/heads/master.tar.gz nix-shell -p steam --run steam

and now... its about proton...

OPENGL ERROR: failed to choose pixel format for dc 160053
GLContext warn: failed to setup offscreen pixel format: Success.

GLContext: failed to create context: Success.

Failed to initialize graphics.
Make sure you have DirectX 11 installed, have up to date
drivers for your graphics card and have not disabled
3D acceleration in display settings.
InitializeEngineGraphics failed