machines/rana: hardcode kernel to version 6.12 to fix freezing issue

flake.lock

@@ -207,11 +207,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1772173633,
+        "lastModified": 1774794121,
-        "narHash": "sha256-MOH58F4AIbCkh6qlQcwMycyk5SWvsqnS/TCfnqDlpj4=",
+        "narHash": "sha256-gih24b728CK8twDNU7VX9vVYK2tLEXvy9gm/GKq2VeE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "c0f3d81a7ddbc2b1332be0d8481a672b4f6004d6",
+        "rev": "c397ef6af68c018462d786e1b65384abc472a907",
         "type": "github"
       },
       "original": {

machines/rana/configuration.nix

@@ -1,4 +1,4 @@
-{ self, ... }:
+{ self, pkgs, ... }:
 {
   imports = [
     self.nixosModules.common
@@ -9,4 +9,12 @@
   };
   system.stateVersion = "25.11";
   clan.core.sops.defaultGroups = [ "admins" ];
+
+  boot.kernelParams = [
+    "amdgpu.dcdebugmask=0x10"
+    "amdgpu.cwsr_enable=0"
+    "amdgpu.gpu_recovery=1"
+  ];
+
+  boot.kernelPackages = pkgs.linuxKernel.packages.linux_6_12;
 }

modules/clan/personal-computer/printing.nix

@@ -22,11 +22,27 @@ let
 
 in
 {
+  environment.systemPackages = [ pkgs.simple-scan ];
+  nixpkgs.config.allowUnfreePredicate =
+    pkg:
+    builtins.elem (lib.getName pkg) [
+      "brgenml1lpr"
+      "cups-brother-dcpt310"
+      "cups-brother-dcpt720dw"
+      "cups-brother-dcpt725dw"
+    ];
+  # nixpkgs.config.allowUnfree = true;
+  services.ipp-usb.enable = true;
   services.printing = {
     enable = true;
     drivers = [
       pkgs.brlaser
       pkgs.gutenprint
+      pkgs.brgenml1lpr
+      pkgs.brgenml1cupswrapper
+      pkgs.cups-brother-dcpt310
+      pkgs.cups-brother-dcpt720dw
+      pkgs.cups-brother-dcpt725dw
     ];
 
     extraFilesConf = ''