Changes

hosts/extern/boot/default.nix

@@ -1,8 +1,12 @@
-{ pkgs, ... }:
+{ pkgs, lib, ... }:
 {
   boot = {
     kernelPackages = pkgs.unstable.linuxPackages_latest;
-    kernel.sysctl."vm.max_map_count" = 2147483642;
     blacklistedKernelModules = [ "pcspkr" ];
   };
+
+  # Kernel that won't explode the MacBook Air
+  specialisation.nouveau.configuration.config = {
+    boot.kernelPackages = lib.mkForce pkgs.linuxPackages_5_10;
+  };
 }

hosts/tower/boot/default.nix

@@ -17,7 +17,6 @@ in {
   boot = {
     # Must be Zen for IOMMU isolation
     kernelPackages = pkgs.unstable.linuxPackages_zen;
-    kernel.sysctl."vm.max_map_count" = 2147483642;
     kernelParams = commonKernelParams ++ [ "vfio-pci.ids=10de:1f82,10de:10fa" ];
     blacklistedKernelModules = [ "pcspkr" ];
 
@@ -42,6 +41,6 @@ in {
   specialisation.nouveau.configuration.config = {
     system.video.nvidia.enable = lib.mkForce false;
     system.video.nouveau.enable = lib.mkForce true;
-    environment.sessionVariables.NIXOS_OZONE_WL = lib.mkForce "0";
+    environment.sessionVariables.NIXOS_OZONE_WL = lib.mkForce "";
   };
 }

modules/system/devices/boot/default.nix

@@ -5,4 +5,9 @@
     ./services
     ./systemd
   ];
+
+  boot.kernel.sysctl = {
+    "vm.max_map_count" = 2147483642;
+    "kernel.sysrq" = 1;
+  };
 }

modules/system/services/general/default.nix

@@ -2,6 +2,7 @@
 {
   imports = [
     ./displaymanager
+    ./earlyoom
     ./gnome-keyring
     ./gvfs
     ./keyd

modules/system/services/general/earlyoom/default.nix

@@ -0,0 +1,4 @@
+{ ... }:
+{
+  services.earlyoom.enable = true;
+}