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power-action: replace krebs module with native upower
Uses services.upower for suspend on critical battery and a lightweight
systemd user service for espeak warnings. Removes krebs.power-action
dependency, special user, and sudo hacks.
Import moved from desktop configs to individual machine configs
(xerxes, ignavia) for explicit control.
author
lassulus
date
(Jan 17, 2026, 1:49 PM CET)
commit
204c87e8
204c87e8822fb064bba275e8e93473c82dff750e
parent
9b3b6329
9b3b6329e195d08e2baab0714744905f1d4763fe
+37
-43
-1
2configs/default.nix
-1
2configs/default.nix
···
49
49
self.inputs.stockholm.nixosModules.exim-retiolum
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50
self.inputs.stockholm.nixosModules.tinc
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51
self.inputs.stockholm.nixosModules.iptables
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-
self.inputs.stockholm.nixosModules.power-action
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self.inputs.stockholm.nixosModules.setuid
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self.inputs.stockholm.nixosModules.secret
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self.inputs.stockholm.nixosModules.sitemap
+35
-36
2configs/power-action.nix
+35
-36
2configs/power-action.nix
···
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-
{ config, pkgs, ... }:
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{ pkgs, ... }:
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let
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suspend = pkgs.writers.writeDash "suspend" ''
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${pkgs.systemd}/bin/systemctl suspend
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# Script that monitors upower D-Bus signals and speaks when battery gets low
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batteryMonitor = pkgs.writers.writeBash "battery-monitor" ''
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${pkgs.upower}/bin/upower --monitor-detail | while read -r line; do
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if echo "$line" | grep -q "warning-level:.*low"; then
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${pkgs.espeak}/bin/espeak -v +whisper -s 110 "power level low"
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fi
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done
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'';
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-
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speak =
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text:
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pkgs.writers.writeDash "speak" ''
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${pkgs.espeak}/bin/espeak -v +whisper -s 110 "${text}"
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'';
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in
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{
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krebs.power-action = {
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# UPower handles battery monitoring via kernel events (not polling)
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services.upower = {
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enable = true;
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plans.low-battery = {
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upperLimit = 10;
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lowerLimit = 15;
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charging = false;
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action = pkgs.writers.writeDash "warn-low-battery" ''
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${speak "power level low"}
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'';
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};
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plans.suspend = {
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upperLimit = 10;
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lowerLimit = 0;
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charging = false;
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action = pkgs.writers.writeDash "suspend-wrapper" ''
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/run/wrappers/bin/sudo ${suspend}
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'';
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};
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user = "lass";
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+
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# Use percentage thresholds instead of time-based
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usePercentageForPolicy = true;
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+
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# Warning levels (triggers D-Bus signals for our monitor)
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percentageLow = 15;
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percentageCritical = 10;
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+
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# Suspend when battery drops below this
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percentageAction = 5;
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+
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# Action to take at critical level
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criticalPowerAction = "Suspend";
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allowRiskyCriticalPowerAction = true;
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};
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users.users.power-action = {
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isNormalUser = true;
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extraGroups = [
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"audio"
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];
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};
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# User service to monitor battery and speak warnings
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systemd.user.services.battery-warning = {
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description = "Battery low warning speaker";
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wantedBy = [ "default.target" ];
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after = [ "upower.service" ];
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security.sudo.extraConfig = ''
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${config.krebs.power-action.user} ALL= (root) NOPASSWD: ${suspend}
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'';
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serviceConfig = {
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ExecStart = batteryMonitor;
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Restart = "always";
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RestartSec = 5;
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};
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};
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}
-2
machines/styx/config.nix
-2
machines/styx/config.nix
+1
machines/xerxes/config.nix
+1
machines/xerxes/config.nix
-1
2configs/desktops/lib/wayland.nix
-1
2configs/desktops/lib/wayland.nix