From 45ab7efecf0f14a8138b062a149a2381a639eda8 Mon Sep 17 00:00:00 2001
From: Sergei Poljanski <me@asxp.io>
Date: Fri, 20 Mar 2026 20:18:05 +0300
Subject: [PATCH] powersave config

---
 configuration.nix    |  1 +
 modules/packages.nix |  2 ++
 modules/power.nix    | 61 ++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 64 insertions(+)
 create mode 100644 modules/power.nix

diff --git a/configuration.nix b/configuration.nix
index 88c1e38..444270b 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -15,6 +15,7 @@
     ./modules/programs.nix
     ./modules/wireguard.nix
     ./modules/security.nix
+    ./modules/power.nix
   ];
 
   # This value determines the NixOS release from which the default
diff --git a/modules/packages.nix b/modules/packages.nix
index 0c4ebe9..e1ad694 100644
--- a/modules/packages.nix
+++ b/modules/packages.nix
@@ -95,6 +95,8 @@
     kubectx         # switch between contexts/namespaces
     stern           # multi-pod log tailing
     hcloud          # Hetzner Cloud CLI
+    packer          # image builder
+    talosctl        # Talos OS CLI
     eksctl          # AWS EKS CLI
     # terragrunt    # broken in nixpkgs
     gh
diff --git a/modules/power.nix b/modules/power.nix
new file mode 100644
index 0000000..5eea7c4
--- /dev/null
+++ b/modules/power.nix
@@ -0,0 +1,61 @@
+# Power management — ThinkPad T14 Gen 2 (AMD)
+{ config, pkgs, lib, ... }:
+
+{
+  # AMD P-State driver (active mode for full EPP control)
+  boot.kernelParams = [ "amd_pstate=active" ];
+
+  # CPU frequency scaling
+  powerManagement.cpuFreqGovernor = "powersave";
+
+  # Disable power-profiles-daemon (conflicts with TLP)
+  services.power-profiles-daemon.enable = false;
+
+  # TLP — main power management daemon
+  services.tlp = {
+    enable = true;
+    settings = {
+      # CPU
+      CPU_SCALING_GOVERNOR_ON_AC = "performance";
+      CPU_SCALING_GOVERNOR_ON_BAT = "powersave";
+      CPU_ENERGY_PERF_POLICY_ON_AC = "balance_performance";
+      CPU_ENERGY_PERF_POLICY_ON_BAT = "power";
+      CPU_BOOST_ON_AC = 1;
+      CPU_BOOST_ON_BAT = 0;
+      PLATFORM_PROFILE_ON_AC = "balanced";
+      PLATFORM_PROFILE_ON_BAT = "low-power";
+
+      # AMD P-State
+      CPU_DRIVER_OPMODE_ON_AC = "active";
+      CPU_DRIVER_OPMODE_ON_BAT = "active";
+
+      # WiFi
+      WIFI_PWR_MGT_ON_AC = "off";
+      WIFI_PWR_MGT_ON_BAT = "on";
+
+      # PCIe ASPM
+      PCIE_ASPM_ON_AC = "default";
+      PCIE_ASPM_ON_BAT = "powersupersave";
+
+      # Runtime PM
+      RUNTIME_PM_ON_AC = "on";
+      RUNTIME_PM_ON_BAT = "auto";
+
+      # NVMe
+      NVME_RUNTIME_PM_ON_AC = "on";
+      NVME_RUNTIME_PM_ON_BAT = "auto";
+
+      # USB autosuspend
+      USB_AUTOSUSPEND = 1;
+    };
+  };
+
+  # Bluetooth off at boot
+  hardware.bluetooth.powerOnBoot = false;
+
+  # Battery monitoring
+  services.upower.enable = true;
+
+  # powertop for diagnostics
+  environment.systemPackages = [ pkgs.powertop ];
+}