many changes

hosts/gpd-win4/modules/nvim

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+../../nb/modules/nvim

hosts/gpd-win4/modules/steam-deck-mode.nix

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+{ config, lib, pkgs, ... }:
+let
+  cfgUser = "dominik"; # Adjust to your username
+in {
+  #### 1) Provide two scripts:
+  ####    - `steam-deck-mode.sh`: Runs Steam Big Picture with Gamescope (Wayland).
+  ####    - `sway-session.sh`: Starts Sway.
+  environment.etc."steam-deck-mode.sh".text = ''
+    #!/usr/bin/env bash
+
+    # This script launches Steam in Big Picture mode under Gamescope (Wayland).
+    # Once Steam (or Gamescope) exits, the systemd user service stops.
+    # The ExecStopPost hook in the user service will then start Sway automatically.
+
+    # For safety, kill any existing Steam instance
+    pgrep steam && steam -shutdown || true
+    sleep 1
+
+    # Use Gamescope in fullscreen mode, exit on Steam exit, run Steam in Gamepad UI
+    exec gamescope -W 1280 -H 800 -f -e -- steam -gamepadui
+  '';
+
+  environment.etc."sway-session.sh".text = ''
+    #!/usr/bin/env bash
+
+    # This script starts a Sway session. When Sway exits, the user service stops,
+    # which triggers ExecStopPost to start Steam Big Picture again.
+
+    exec sway
+  '';
+
+  #### Make these scripts executable via a simple systemd service:
+  systemd.services."make-scripts-executable" = {
+    description = "Make steam-deck-mode.sh and sway-session.sh executable";
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig.ExecStart = [
+      "${pkgs.coreutils}/bin/chmod +x /etc/steam-deck-mode.sh"
+      "${pkgs.coreutils}/bin/chmod +x /etc/sway-session.sh"
+    ];
+  };
+
+  #### 2) Create two systemd *user* services:
+  ####    - steam-deck-mode: On stop, automatically start sway
+  ####    - sway: On stop, automatically start steam-deck-mode
+  systemd.user.services."steam-deck-mode" = {
+    description = "Steam Deck Mode (Wayland Gamescope + Steam Big Picture)";
+    wantedBy = [ "default.target" ];  # So we can enable it for the user
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "/etc/steam-deck-mode.sh";
+      # On exit, automatically trigger Sway
+      ExecStopPost = "${pkgs.systemd}/bin/systemctl --user start sway";
+      Restart = "no";  # If Steam crashes, you can change to 'on-failure' if desired
+    };
+  };
+
+  systemd.user.services."sway" = {
+    description = "Sway WM Session";
+    wantedBy = [ ];  # We won't start this on login by default, but from steam or a script
+    serviceConfig = {
+      Type = "simple";
+      ExecStart = "/etc/sway-session.sh";
+      # On exit, automatically trigger Steam Deck Mode
+      ExecStopPost = "${pkgs.systemd}/bin/systemctl --user start steam-deck-mode";
+      Restart = "no";
+    };
+  };
+
+  #### 3) Provide a script & desktop entry to let you switch from Sway to Game Mode easily
+  ####    (i.e., stop the 'sway' service, which triggers Steam).
+  environment.etc."switch-to-game-mode.sh".text = ''
+    #!/usr/bin/env bash
+    # This script stops Sway, causing the user service to exit
+    # The ExecStopPost of that service will start steam-deck-mode automatically.
+    ${pkgs.systemd}/bin/systemctl --user stop sway
+  '';
+
+  systemd.services."make-switch-to-game-mode-executable" = {
+    description = "Make switch-to-game-mode.sh executable";
+    wantedBy = [ "multi-user.target" ];
+    serviceConfig.ExecStart = [
+      "${pkgs.coreutils}/bin/chmod +x /etc/switch-to-game-mode.sh"
+    ];
+  };
+
+  environment.etc."xdg/applications/switch-to-game-mode.desktop".text = ''
+    [Desktop Entry]
+    Name=Switch to Game Mode
+    Comment=Stop Sway and start Steam Big Picture (Gamescope)
+    Exec=/etc/switch-to-game-mode.sh
+    Terminal=false
+    Type=Application
+    Categories=Game;
+  '';
+
+  #### 4) If you want to start directly in Steam Deck Mode on boot (no display manager),
+  ####    enable auto-login on TTY and run the user service for "dominik".
+  ####    For example (uncomment if you want an immediate console login):
+  # services.getty.autologinUser = cfgUser;
+  # systemd.user.services."steam-deck-mode".wantedBy = [ "default.target" ];  # already set
+  # You'd do 'systemctl --user enable steam-deck-mode' as that user to start it on login.
+
+  #### 5) Additional recommended gaming packages if not set elsewhere:
+  environment.systemPackages = with pkgs; [
+    steam
+    gamemode
+    mangohud
+    vulkan-tools
+    vulkan-loader
+    vulkan-headers
+    # ...
+  ];
+
+  #### 6) Enable 32-bit support for Steam
+  hardware.opengl.enable = true;
+  hardware.opengl.driSupport32Bit = true;
+  hardware.graphics.enable = true;
+  hardware.graphics.enable32Bit = true;
+  hardware.graphics.extraPackages = [
+    pkgs.amdvlk
+    pkgs.driversi686Linux.amdvlk
+  ];
+
+  #### 7) Optionally handle udev rules for Steam/Controllers if needed
+  environment.etc."udev/rules.d/99-steamdeck-controller.rules".text = ''
+    SUBSYSTEM=="usb", ATTRS{idVendor}=="28de", MODE="0666"
+    KERNEL=="uinput", MODE="0660", GROUP="input", OPTIONS+="static_node=uinput"
+  '';
+}

hosts/gpd-win4/modules/steam.nix

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+{ config, lib, pkgs, ... }:
+let
+  # For GPD Win4’s AMD APU, we assume AMD Vulkan drivers:
+  amdPackages = [
+    pkgs.amdvlk
+    pkgs.driversi686Linux.amdvlk
+  ];
+in
+{
+  options.services.steamDeckMode = {
+    enable = lib.mkOption {
+      type = lib.types.bool;
+      default = false;
+      description = "Launch Steam in a ‘Deck-like’ session upon login (auto-logins and starts Steam in gamepad UI mode).";
+    };
+  };
+
+  config = {
+    # Enable Steam and Gamescope
+    programs.gamescope = {
+      enable = true;
+      capSysNice = true;
+    };
+    programs.steam = {
+      enable = true;
+      # The ‘gamescopeSession’ creates a special session for Steam on Wayland
+      gamescopeSession.enable = true;
+    };
+
+    # Add some helpful gaming utilities
+    environment.systemPackages = with pkgs; [
+      mangohud
+      steam-tui
+      steamcmd
+      vulkan-tools
+      vulkan-headers
+      vulkan-loader
+      wlroots
+      libdecor
+      gamemode
+    ];
+
+    # Enable 32-bit support for libraries (often required by Steam)
+    hardware.opengl.enable = true;
+    hardware.opengl.driSupport32Bit = true;
+
+    # Additional AMD drivers if needed
+    hardware.graphics.enable = true;
+    hardware.graphics.enable32Bit = true;
+    hardware.graphics.extraPackages = amdPackages;
+
+    # Example udev rules for Steam Deck controllers, optional
+    environment.etc."udev/rules.d/99-steamdeck-controller.rules".text = ''
+      # Valve Controller devices
+      SUBSYSTEM=="usb", ATTRS{idVendor}=="28de", MODE="0666"
+      KERNEL=="uinput", MODE="0660", GROUP="input", OPTIONS+="static_node=uinput"
+    '';
+
+    # Provide a “Steam Deck Mode” session in the display manager
+    services.xserver.displayManager.session = {
+      "steam-deck-mode" = {
+        name = "Steam Deck Mode";
+        start = ''
+          #!/usr/bin/env bash
+          # On X11, you could also remove or adjust the following env variable if you prefer Wayland
+          export XDG_SESSION_TYPE=x11
+
+          # Fullscreen + close gamescope on exit, then run Steam in gamepad UI
+          exec gamescope -f -e -- steam -gamepadui
+        '';
+      };
+    };
+  }
+  // lib.mkIf config.services.steamDeckMode.enable {
+    # Auto-login to the user of your choice and start in Steam Deck Mode
+    services.xserver.displayManager.autoLogin.enable = true;
+    services.xserver.displayManager.autoLogin.user = "dominik"; # or your preferred user
+    services.xserver.autoRestartXServer = true;
+    services.xserver.displayManager.defaultSession = "steam-deck-mode";
+  };

hosts/gpd-win4/modules/sway

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+../../nb/modules/sway