From e0a8e0107321a86e307e9c01d91bd27b03d665d7 Mon Sep 17 00:00:00 2001
From: Alberto Berti <alberto@metapensiero.it>
Date: Thu, 31 May 2018 18:04:02 +0200
Subject: [PATCH] Give TLP more control over the battery and enable battery
 life saver parameters

---
 lenovo/thinkpad/x1/6th-gen/QHD/default.nix | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lenovo/thinkpad/x1/6th-gen/QHD/default.nix b/lenovo/thinkpad/x1/6th-gen/QHD/default.nix
index 55438fd..1122d77 100644
--- a/lenovo/thinkpad/x1/6th-gen/QHD/default.nix
+++ b/lenovo/thinkpad/x1/6th-gen/QHD/default.nix
@@ -1,9 +1,26 @@
 # X1 6th generation with a QHD (2560x1440px) display
+{ config,  ... }:
+
 {
   imports = [
     ../.
   ];
+  # give tlp more control over battery
+  boot = {
+    extraModulePackages = with config.boot.kernelPackages; [
+      acpi_call
+    ];
+    kernelModules = [
+      "acpi_call"
+    ];
+  };
 
+  # see https://linrunner.de/en/tlp/docs/tlp-faq.html#battery
+  services.tlp.extraConfig = ''
+START_CHARGE_THRESH_BAT0=75
+STOP_CHARGE_THRESH_BAT0=80
+'';
+  # fix font sizes in X
   services.xserver.dpi = 210;
   fonts.fontconfig.dpi = 210;
 }