Configure TLP to maximize power savings on battery

configuration.nix

@@ -66,7 +66,37 @@
   services.timesyncd.enable = true;
 
   # Enable the TLP daemon
-  services.tlp.enable = true;
+  services.tlp = {
+    enable = true;
+    extraConfig = ''
+      # Use the new CPU frequency scaling governor
+      CPU_SCALING_GOVERNOR_ON_AC=schedutil
+      CPU_SCALING_GOVERNOR_ON_BAT=schedutil
+
+      # Adjust CPU frequencies accordingly to the power state
+      CPU_SCALING_MIN_FREQ_ON_AC=800000
+      CPU_SCALING_MAX_FREQ_ON_AC=3000000
+      CPU_SCALING_MIN_FREQ_ON_BAT=800000
+      CPU_SCALING_MAX_FREQ_ON_BAT=2300000
+
+      # Enable audio power saving for Intel HDA, AC97 devices (timeout in secs).
+      # A value of 0 disables, >=1 enables power saving (recommended: 1).
+      # Default: 0 (AC), 1 (BAT)
+      SOUND_POWER_SAVE_ON_AC=0
+      SOUND_POWER_SAVE_ON_BAT=1
+
+      # Runtime Power Management for PCI(e) bus devices: on=disable, auto=enable.
+      # Default: on (AC), auto (BAT)
+      RUNTIME_PM_ON_AC=on
+      RUNTIME_PM_ON_BAT=auto
+
+      # Battery feature drivers: 0=disable, 1=enable
+      # Default: 1 (all)
+      NATACPI_ENABLE=1
+      TPACPI_ENABLE=1
+      TPSMAPI_ENABLE=1
+    '';
+  };
 
   # NixOS version
   system.stateVersion = "20.09";