nixpkgs/modules/services/audio/alsa.nix
Peter Simons 97c74bf050 alsa.nix: initialize the sound card before restoring previously stored settings
The sound card in my ThinkPad won't work unless "init" is run explicitly.
2012-09-23 22:40:19 +02:00

72 lines
1.3 KiB
Nix

# ALSA sound support.
{ config, pkgs, ... }:
with pkgs.lib;
let
inherit (pkgs) alsaUtils;
soundState = "/var/lib/alsa/asound.state";
in
{
###### interface
options = {
sound = {
enable = mkOption {
default = true;
description = ''
Whether to enable ALSA sound.
'';
merge = mergeEnableOption;
};
enableOSSEmulation = mkOption {
default = true;
description = ''
Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).
'';
};
};
};
###### implementation
config = mkIf config.sound.enable {
environment.systemPackages = [ alsaUtils ];
boot.kernelModules = optional config.sound.enableOSSEmulation "snd_pcm_oss";
jobs.alsa =
{ startOn = "stopped udevtrigger";
preStart =
''
mkdir -m 0755 -p $(dirname ${soundState})
# Try to restore the sound state.
${alsaUtils}/sbin/alsactl --ignore init || true
${alsaUtils}/sbin/alsactl --ignore -f ${soundState} restore || true
'';
postStop =
''
# Save the sound state.
${alsaUtils}/sbin/alsactl --ignore -f ${soundState} store
'';
};
};
}