Init Lenovo ThinkPad E14

lenovo/thinkpad/e14/amd/default.nix

@@ -0,0 +1,23 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ../.
+    ../../../../common/cpu/amd
+  ];
+
+  boot.kernelParams = [
+    # With BIOS version 1.12 and the IOMMU enabled, the amdgpu driver
+    # either crashes or is not able to attach to the GPU depending on
+    # the kernel version. I've seen no issues with the IOMMU disabled.
+    #
+    # BIOS version 1.13 claims to fix IOMMU issues, but we leave the
+    # IOMMU off to avoid a sad experience for those people that drew
+    # the short straw when they bought their laptop.
+    "iommu=off"
+  ];
+
+  # As of writing this, Linux 5.8 is the oldest kernel that is still
+  # supported and has decent Renoir support.
+  boot.kernelPackages = lib.mkIf (lib.versionOlder pkgs.linux.version "5.8") pkgs.linuxPackages_latest;
+}

lenovo/thinkpad/e14/default.nix

@@ -0,0 +1,14 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ../.
+    ../../../common/pc/laptop/acpi_call.nix
+  ];
+
+  boot.kernelParams = [
+    # Force use of the thinkpad_acpi driver for backlight control.
+    # This allows the backlight save/load systemd service to work.
+    "acpi_backlight=native"
+  ];
+}

lenovo/thinkpad/e14/intel/default.nix

@@ -0,0 +1,10 @@
+{ config, lib, pkgs, ... }:
+
+{
+  imports = [
+    ../.
+    ../../../../common/cpu/intel
+  ];
+
+  services.throttled.enable = lib.mkDefault true;
+}