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108 lines
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{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.powerManagement;
in
{
###### interface
options = {
powerManagement = {
enable = mkOption {
default = true;
description =
''
Whether to enable power management. This includes support
for suspend-to-RAM and powersave features on laptops.
'';
};
resumeCommands = mkOption {
default = "";
description = "Commands executed after the system resumes from suspend-to-RAM.";
};
powerUpCommands = mkOption {
default = "";
example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
description =
''
Commands executed when the machine powers up. That is,
they're executed both when the system first boots and when
it resumes from suspend or hibernation.
'';
};
powerDownCommands = mkOption {
default = "";
example = "${pkgs.hdparm}/sbin/hdparm -B 255 /dev/sda";
description =
''
Commands executed when the machine powers down. That is,
they're executed both when the system shuts down and when
it goes to suspend or hibernation.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
# Enable the ACPI daemon. Not sure whether this is essential.
services.acpid.enable = true;
boot.kernelModules =
[ "acpi_cpufreq" "powernow-k8" "cpufreq_performance" "cpufreq_powersave" "cpufreq_ondemand"
"cpufreq_conservative"
];
powerManagement.cpuFreqGovernor = mkDefault "ondemand";
powerManagement.scsiLinkPolicy = mkDefault "min_power";
systemd.targets.post-resume = {
description = "Post-Resume Actions";
requires = [ "post-resume.service" ];
after = [ "post-resume.service" ];
wantedBy = [ "sleep.target" ];
unitConfig.StopWhenUnneeded = true;
};
# Service executed before suspending/hibernating.
systemd.services."pre-sleep" =
{ description = "Pre-Sleep Actions";
wantedBy = [ "sleep.target" ];
before = [ "sleep.target" ];
script =
''
${cfg.powerDownCommands}
'';
serviceConfig.Type = "oneshot";
};
systemd.services."post-resume" =
{ description = "Post-Resume Actions";
after = [ "suspend.target" "hibernate.target" "hybrid-sleep.target" ];
script =
''
${cfg.resumeCommands}
${cfg.powerUpCommands}
'';
serviceConfig.Type = "oneshot";
};
};
}