Created
March 5, 2026 11:59
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| { config, lib, pkgs, ... }: | |
| let | |
| systemctl = "/run/current-system/systemd/bin/systemctl"; | |
| in | |
| { | |
| services.udev.extraRules = '' | |
| SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_TYPE}=="Battery", ENV{POWER_SUPPLY_STATUS}=="Discharging", RUN+="${systemctl} start on-battery.target" | |
| SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_TYPE}=="Battery", ENV{POWER_SUPPLY_STATUS}=="Charging", RUN+="${systemctl} stop on-battery.target" | |
| SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_TYPE}=="Mains", ENV{POWER_SUPPLY_ONLINE}=="1", RUN+="${systemctl} start on-mains.target" | |
| SUBSYSTEM=="power_supply", ENV{POWER_SUPPLY_TYPE}=="Mains", ENV{POWER_SUPPLY_STATUS}=="0", RUN+="${systemctl} stop on-mains.target" | |
| ''; | |
| systemd.targets."on-battery" = { | |
| conflicts = [ "on-mains.target" ]; | |
| }; | |
| systemd.targets."on-mains" = { | |
| conflicts = [ "on-battery.target" ] ; | |
| }; | |
| systemd.services."power-state" = { | |
| description = "Triggers initial powerstate change, as udev events are unreliable during boot"; | |
| wantedBy = [ "multi-user.target" ]; | |
| serviceConfig = { | |
| Type = "oneshot"; | |
| ExecStart = pkgs.writeShellScript "power-state" '' | |
| AC=$(cat /sys/class/power_supply/AC*/online) | |
| BAT=$(cat /sys/class/power_supply/BAT*/status) | |
| if [[ $BAT == "Charging" || $AC == "1" ]]; then | |
| ${systemctl} start on-mains.target | |
| fi | |
| if [[ $BAT=="Discharging" || $AC=="0" ]]; then | |
| ${systemctl} start on-battery.target | |
| fi | |
| ''; | |
| }; | |
| }; | |
| systemd.services."low-power" = { | |
| description = "a low-power configuration"; | |
| after = [ "on-battery.target" ]; | |
| wantedBy = [ "on-battery.target" ]; | |
| serviceConfig = { | |
| Type = "oneshot"; | |
| ExecStart = pkgs.writeShellScript "enable-low-power" '' | |
| echo balance_power | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference >/dev/null | |
| ''; | |
| }; | |
| }; | |
| systemd.services."high-power" = { | |
| description = "a high-power configuration"; | |
| after = [ "on-mains.target" ]; | |
| wantedBy = [ "on-mains.target" ]; | |
| serviceConfig = { | |
| Type = "oneshot"; | |
| ExecStart = pkgs.writeShellScript "enable-high-power" '' | |
| echo balance_performance | tee /sys/devices/system/cpu/cpufreq/policy*/energy_performance_preference >/dev/null | |
| ''; | |
| }; | |
| }; | |
| } |
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