Hardware/Microsoft/Surface Go 2

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Microsoft Surface Go 2
Manufacturer	Microsoft
Architecture	x86_64
Bootloader	64-bit GRUB
Maintainer	onny

The Surface Go 2 is a portable 2-in-1 detachable tablet computer by Microsoft, featuring a 10.5-inch PixelSense Display, Intel® Pentium® Gold or Pentium® M processors, and optional LTE connectivity.

Setup

Support for webcam and LTE modem requires a custom kernel from the linux-surface project. Adapt the flake.nix of your system configuration to include the nixos-hardware repository and the specific module for your device: nixos-hardware.nixosModules.microsoft-surface-go.

{
  description = "NixOS configuration with flakes";
  inputs.nixos-hardware.url = "github:NixOS/nixos-hardware/master";

  outputs = { self, nixpkgs, nixos-hardware }: {
    # replace <your-hostname> with your actual hostname
    nixosConfigurations.<your-hostname> = nixpkgs.lib.nixosSystem {
      # ...
      modules = [
        # ...
        nixos-hardware.nixosModules.microsoft-surface-go
      ];
    };
  };
}

After that rebuild your system and reboot the machine. If the LTE modem does not appear in your network manager directly, a small workaround script is required. Add this to your system configuration

systemd.services.lte_modem_fix = let
  modemFixScript = pkgs.writeScriptBin "fix_lte_modem" ''
    #!${pkgs.stdenv.shell}
    echo -n 16383 > /sys/bus/usb/devices/2-3:1.0/net/wwp0s20f0u3/cdc_ncm/rx_max
    echo -n 16383 > /sys/bus/usb/devices/2-3:1.0/net/wwp0s20f0u3/cdc_ncm/tx_max
    echo -n 16384 > /sys/bus/usb/devices/2-3:1.0/net/wwp0s20f0u3/cdc_ncm/rx_max
    echo -n 16384 > /sys/bus/usb/devices/2-3:1.0/net/wwp0s20f0u3/cdc_ncm/tx_max
  '';
in {
  wantedBy = ["multi-user.target"];
  serviceConfig = {
    Type = "oneshot";
    ExecStart = "${modemFixScript}/bin/fix_lte_modem";
  };
};
systemd.services.ModemManager.wantedBy = ["multi-user.target"];

It will take a couple of seconds for the modem to appear.