9 files changed, 48 insertions, 0 deletions
diff --git a/common/README.org b/common/README.org
new file mode 100644
index 000000000000..3239e2f23b94
--- /dev/null
+++ b/common/README.org
@@ -0,0 +1,2 @@
+*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.
diff --git a/common/cpu/amd/default.nix b/common/cpu/amd/default.nix
new file mode 100644
index 000000000000..a8a36b2c91ba
--- /dev/null
+++ b/common/cpu/amd/default.nix
@@ -0,0 +1,3 @@
+{
+  hardware.cpu.amd.updateMicrocode = true;
+}
diff --git a/common/cpu/intel/default.nix b/common/cpu/intel/default.nix
new file mode 100644
index 000000000000..e3ce9193050e
--- /dev/null
+++ b/common/cpu/intel/default.nix
@@ -0,0 +1,4 @@
+{
+  hardware.cpu.intel.updateMicrocode = true;
+  services.xserver.videoDrivers = [ "intel" ];
+}
diff --git a/common/pc/default.nix b/common/pc/default.nix
new file mode 100644
index 000000000000..0b498ff1d20e
--- /dev/null
+++ b/common/pc/default.nix
@@ -0,0 +1,5 @@
+{ lib, ... }:
+
+{
+  services.xserver.libinput.enable = lib.mkDefault true;
+}
diff --git a/common/pc/hdd/default.nix b/common/pc/hdd/default.nix
new file mode 100644
index 000000000000..8cc5ada0deb9
--- /dev/null
+++ b/common/pc/hdd/default.nix
@@ -0,0 +1,7 @@
+{ lib, ... }:
+
+{
+  boot.kernel.sysctl = {
+    "vm.swappiness" = lib.mkDefault 10;
+  };
+}
diff --git a/common/pc/laptop/default.nix b/common/pc/laptop/default.nix
new file mode 100644
index 000000000000..305c160e2094
--- /dev/null
+++ b/common/pc/laptop/default.nix
@@ -0,0 +1,11 @@
+{ lib, ... }:
+
+{
+  imports = [ ../. ];
+
+  boot.kernel.sysctl = {
+    "vm.laptop_mode" = lib.mkDefault 5;
+  };
+
+  services.tlp.enable = lib.mkDefault true;
+}
diff --git a/common/pc/laptop/hdd/default.nix b/common/pc/laptop/hdd/default.nix
new file mode 100644
index 000000000000..63f29d458c29
--- /dev/null
+++ b/common/pc/laptop/hdd/default.nix
@@ -0,0 +1,8 @@
+{ lib, ... }:
+
+{
+  imports = [ ../../hdd ];
+
+  # Hard disk protection if the laptop falls:
+  services.hdapsd.enable = lib.mkDefault true;
+}
diff --git a/common/pc/laptop/ssd b/common/pc/laptop/ssd
new file mode 120000
index 000000000000..e313834a4372
--- /dev/null
+++ b/common/pc/laptop/ssd
@@ -0,0 +1 @@
+../ssd
\ No newline at end of file
diff --git a/common/pc/ssd/default.nix b/common/pc/ssd/default.nix
new file mode 100644
index 000000000000..af0b49568cd1
--- /dev/null
+++ b/common/pc/ssd/default.nix
@@ -0,0 +1,7 @@
+{ lib, ... }:
+
+{
+  boot.kernel.sysctl = {
+    "vm.swappiness" = lib.mkDefault 1;
+  };
+}