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nixos/powerManagement: set cpuFreqGovernor with mkOptionDefault

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`nixos-generate-config` detects the `cpuFreqGovernor` suited best for my
machine, e.g. `powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";`.

However the `powerManagement` module sets a sensitive default for
`cpuFreqGovernor` using `mkDefault` to avoid breackage with older
setups. Since 140ac2f1 the `hardware-configuration.nix` sets the
gorvernor with `mkDefault` as well which causes evaluation errors if the
powermanagement module is enabled:

```
error: The unique option `powerManagement.cpuFreqGovernor' is defined multiple times, in `/home/ma27/Projects/nixos-config/hardware-configuration.nix' and `/nix/var/nix/profiles/per-user/root/channels/nixos/nixpkgs/nixos/modules/config/power-management.nix'.
```

Using `mkOptionDefault` rather than `mkDefault` in the powermanagement
module fixes this issue as it decreases the priority of the module and
prefers the value set in `hardware-configuration.nix`.

I have confirmed the change using the following VM declaration:

```
{
  cpuFreq = { lib, ... }: {
    powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
    powerManagement.enable = true;
  };
}
```
This commit is contained in:
Maximilian Bosch 2018-01-28 09:38:45 +01:00
parent fff0daddce
commit 8ed3a90cdf
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GPG Key ID: 091DBF4D1FC46B8E
1 changed files with 1 additions and 1 deletions
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2
nixos/modules/config/power-management.nix
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@ -70,7 +70,7 @@ in
config = mkIf cfg.enable {
# Leftover for old setups, should be set by nixos-generate-config now
powerManagement.cpuFreqGovernor = mkDefault "ondemand";
powerManagement.cpuFreqGovernor = mkOptionDefault "ondemand";
systemd.targets.post-resume = {
description = "Post-Resume Actions";