From 24d89ed7041d00ca8106dc0f588468ec49169713 Mon Sep 17 00:00:00 2001
From: Tom Alexander <tom@fizz.buzz>
Date: Tue, 31 Dec 2024 12:51:23 -0500
Subject: [PATCH] Default to power-saving mode.

---
 nix/configuration/hosts/odo/default.nix       |  1 +
 .../hosts/odo/power_management.nix            | 20 +++++++++++++++++++
 .../hosts/odo/screen_brightness.nix           | 14 +++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 nix/configuration/hosts/odo/screen_brightness.nix

diff --git a/nix/configuration/hosts/odo/default.nix b/nix/configuration/hosts/odo/default.nix
index 489143c..a7d2505 100644
--- a/nix/configuration/hosts/odo/default.nix
+++ b/nix/configuration/hosts/odo/default.nix
@@ -5,6 +5,7 @@
     ./disk-config.nix
     ./optimized_build.nix
     ./power_management.nix
+    ./screen_brightness.nix
   ];
 
   # Generate with `head -c4 /dev/urandom | od -A none -t x4`
diff --git a/nix/configuration/hosts/odo/power_management.nix b/nix/configuration/hosts/odo/power_management.nix
index 3540c5c..96d528f 100644
--- a/nix/configuration/hosts/odo/power_management.nix
+++ b/nix/configuration/hosts/odo/power_management.nix
@@ -26,4 +26,24 @@
     "nowatchdog"
     "amdgpu.dcdebugmask=0x10"
   ];
+
+  systemd.tmpfiles.rules = [
+    "w- /sys/firmware/acpi/platform_profile - - - - low-power"
+    "w- /sys/devices/system/cpu/cpufreq/policy0/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy1/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy2/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy3/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy4/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy5/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy6/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy7/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy8/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy9/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy10/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy11/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy12/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy13/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy14/energy_performance_preference - - - - power"
+    "w- /sys/devices/system/cpu/cpufreq/policy15/energy_performance_preference - - - - power"
+  ];
 }
diff --git a/nix/configuration/hosts/odo/screen_brightness.nix b/nix/configuration/hosts/odo/screen_brightness.nix
new file mode 100644
index 0000000..80c1eac
--- /dev/null
+++ b/nix/configuration/hosts/odo/screen_brightness.nix
@@ -0,0 +1,14 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+{
+  imports = [ ];
+
+  systemd.tmpfiles.rules = [
+    "w- /sys/class/backlight/amdgpu_bl1/brightness - - - - 85"
+  ];
+}