treewide: abstract away common configs into common/

common/README.org

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+*NB!* This subtree is subject to change. Please don't import from here directly
+for now, unless you're OK that things might break at any point in time.

common/cpu/amd/default.nix

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+{
+  hardware.cpu.amd.updateMicrocode = true;
+}

common/cpu/intel/default.nix

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+{
+  hardware.cpu.intel.updateMicrocode = true;
+  services.xserver.videoDrivers = [ "intel" ];
+}

common/pc/default.nix

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+{ lib, ... }:
+
+{
+  services.xserver.libinput.enable = lib.mkDefault true;
+}

common/pc/hdd/default.nix

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+{ lib, ... }:
+
+{
+  boot.kernel.sysctl = {
+    "vm.swappiness" = lib.mkDefault 10;
+  };
+}

common/pc/laptop/default.nix

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+{ lib, ... }:
+
+{
+  imports = [ ../. ];
+
+  boot.kernel.sysctl = {
+    "vm.laptop_mode" = lib.mkDefault 5;
+  };
+
+  services.tlp.enable = lib.mkDefault true;
+}

common/pc/laptop/hdd/default.nix

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+{ lib, ... }:
+
+{
+  imports = [ ../../hdd ];
+
+  # Hard disk protection if the laptop falls:
+  services.hdapsd.enable = lib.mkDefault true;
+}

common/pc/laptop/ssd

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+../ssd

common/pc/ssd/default.nix

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+{ lib, ... }:
+
+{
+  boot.kernel.sysctl = {
+    "vm.swappiness" = lib.mkDefault 1;
+  };
+}