use amd's drm-next branch

modules/graphical/games.nix

@@ -16,7 +16,7 @@ in {
       dedicatedServer.openFirewall =
         true; # Open ports in the firewall for Source Dedicated Server
       gamescopeSession.enable = true;
-      extraCompatPackages = with pkgs; [ proton-ge-bin ];
+      extraCompatPackages = with pkgs; [ proton-ge-bin steamtinkerlaunch ];
     };
     programs.gamemode = {
       enable = true;

modules/graphical/sddm.nix

@@ -12,9 +12,10 @@ in {
 
   config = lib.mkIf cfg.enable {
     services = {
-      displayManager = {
-        sddm.enable = true;
-        sddm.theme = "${pkgs.sddm-astronaut}";
+      displayManager.sddm = {
+        enable = true;
+        theme = "${pkgs.sddm-astronaut}";
+        #wayland.enable = true;
         #sddm.theme = "breeze";
       };
     };

modules/hardware/amd-gpu.nix

@@ -6,31 +6,25 @@ in {
   };
 
   config = lib.mkIf cfg.enable {
-    boot.kernelParams = [ "amdgpu.ppfeaturemask=0xffffffff"  "split_lock_detect=off" ];
+    boot.kernelParams =
+      [ "amdgpu.ppfeaturemask=0xfff7ffff" "split_lock_detect=off" ];
+
     hardware.graphics = {
       enable = true;
       enable32Bit = true;
       package = lib.mkForce pkgs.mesa-git.mesa.drivers;
-      #extraPackages = with pkgs; [ mesa-git.amdvlk ];
+      extraPackages = with pkgs; [ mesa-git.amdvlk ];
     };
 
-    boot.initrd.kernelModules = [ "amdgpu" ];
+    hardware.amdgpu.initrd.enable = lib.mkDefault true;
     services.xserver.videoDrivers = [ "amdgpu" ];
     # controller (overclock, undervolt, fan curves)
-    environment.systemPackages = with pkgs; [ lact nvtopPackages.amd ];
+    environment.systemPackages = with pkgs; [
+      lact
+      nvtopPackages.amd
+      amdgpu_top
+    ];
     systemd.packages = with pkgs; [ lact ];
     systemd.services.lactd.wantedBy = [ "multi-user.target" ];
-
-    hardware.firmware = with pkgs;
-      [
-        (linux-firmware.overrideAttrs (old: {
-          src = builtins.fetchGit {
-            url =
-              "https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git";
-            rev =
-              "b4cb02b2dc3330c6e5d69e84a616b1ca5faecf12"; # Uncomment this line to allow for pure builds
-          };
-        }))
-      ];
   };
 }

modules/kernel.nix

@@ -1,5 +1,85 @@
-{pkgs, ...}:
-{
+{ pkgs, config, ... }:
+let
+#amdgpu_module_pkg =
+#    { pkgs, lib, fetchurl, kernel ? pkgs.linuxPackages_latest.kernel, ... }:
+#
+#    pkgs.stdenv.mkDerivation {
+#      pname = "amdgpu-kernel-module";
+#      inherit (kernel) version postPatch nativeBuildInputs;
+#      src = fetchurl {
+#        url =
+#          "https://gitlab.freedesktop.org/agd5f/linux/-/archive/amd-drm-next-6.15-2025-03-14/linux-amd-drm-next-6.15-2025-03-14.tar.gz";
+#        # After the first build attempt, look for "hash mismatch" and then 2 lines below at the "got:" line.
+#        # Use "sha256-....." value here.
+#        hash = "sha256-/9EvJNBSKteXljrZzmaQkbZ7o4etCe0yFM3JJg/jD7o=";
+#      };
+#
+#      kernel_dev = kernel.dev;
+#      kernelVersion = kernel.modDirVersion;
+#
+#      modulePath = "drivers/gpu/drm/amd/amdgpu";
+#
+#      buildPhase = ''
+#        BUILT_KERNEL=$kernel_dev/lib/modules/$kernelVersion/build
+#
+#        cp $BUILT_KERNEL/Module.symvers .
+#        cp $BUILT_KERNEL/.config        .
+#        cp $kernel_dev/vmlinux          .
+#
+#        make "-j$NIX_BUILD_CORES" modules_prepare
+#        make "-j$NIX_BUILD_CORES" M=$modulePath modules
+#      '';
+#
+#      installPhase = ''
+#        make \
+#          INSTALL_MOD_PATH="$out" \
+#          XZ="xz -T$NIX_BUILD_CORES" \
+#          M="$modulePath" \
+#          modules_install
+#      '';
+#
+#      meta = {
+#        description = "AMD GPU kernel module";
+#        license = lib.licenses.gpl3;
+#      };
+#    };
+#  amdgpu_module = pkgs.callPackage amdgpu_module_pkg {
+#    kernel = config.boot.kernelPackages.kernel;
+#  };
+
+in {
+  #boot.extraModulePackages = [ amdgpu_module ];
   #boot.kernelPackages = pkgs.linuxPackages_latest;
-  boot.kernelPackages = pkgs.linuxPackages_testing;
+  #boot.kernelPackages = pkgs.linuxPackages_testing;
+  #boot.kernelPackages = pkgs.linuxPackagesFor (pkgs.linux_6_13.override {
+  #  argsOverride = rec {
+  #    src = pkgs.fetchurl {
+  #      url = "mirror://kernel/linux/kernel/v6.x/linux-${version}.tar.xz";
+  #      sha256 = "07c08x68fgcsgriss5z8w427h69y52s887vas91jzb5p70hbcf9s";
+  #    };
+  #    version = "6.13.7";
+  #    modDirVersion = "6.13.7";
+  #  };
+  #});
+
+  boot.kernelPackages = let
+    amd_drm_next_pkg = { fetchurl, buildLinux, ... }@args:
+
+      buildLinux (args // rec {
+        version = "6.14.0-rc4";
+        modDirVersion = version;
+
+        src = fetchurl {
+          url =
+            "https://gitlab.freedesktop.org/agd5f/linux/-/archive/amd-drm-next-6.15-2025-03-14/linux-amd-drm-next-6.15-2025-03-14.tar.gz";
+          # After the first build attempt, look for "hash mismatch" and then 2 lines below at the "got:" line.
+          # Use "sha256-....." value here.
+          hash = "sha256-/9EvJNBSKteXljrZzmaQkbZ7o4etCe0yFM3JJg/jD7o=";
+        };
+        kernelPatches = [ ];
+
+        extraMeta.branch = "6.14.0-rc4";
+      } // (args.argsOverride or { }));
+    linux_amd_drm_next = pkgs.callPackage amd_drm_next_pkg { };
+  in pkgs.recurseIntoAttrs (pkgs.linuxPackagesFor linux_amd_drm_next);
 }