c55f496c52
Otherwise the sound card drivers may not have been loaded yet, and restoring the mixer settings will fail. Also, since the ALSA job itself will fail, it won't save the mixer settings on shutdown. svn path=/nixos/trunk/; revision=23245
85 lines
1.6 KiB
Nix
85 lines
1.6 KiB
Nix
# ALSA sound support.
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{ config, pkgs, ... }:
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with pkgs.lib;
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let
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inherit (pkgs) alsaUtils;
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soundState = "/var/lib/alsa/asound.state";
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in
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{
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###### interface
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options = {
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sound = {
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enable = mkOption {
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default = true;
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description = ''
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Whether to enable ALSA sound.
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'';
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merge = mergeEnableOption;
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};
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enableOSSEmulation = mkOption {
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default = true;
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description = ''
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Whether to enable ALSA OSS emulation (with certain cards sound mixing may not work!).
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'';
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};
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};
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};
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###### implementation
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config = mkIf config.sound.enable {
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environment.systemPackages = [alsaUtils];
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users.extraGroups = singleton
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{ # Alsalib seems to require the existence of this group, even
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# if it's not used (e.g., doesn't own any devices).
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name = "audio";
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gid = config.ids.gids.audio;
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};
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jobs.alsa =
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{ startOn = "stopped udevtrigger";
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preStart =
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''
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mkdir -m 0755 -p $(dirname ${soundState})
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# Load some additional modules.
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${optionalString config.sound.enableOSSEmulation
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''
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for mod in snd_pcm_oss; do
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${config.system.sbin.modprobe}/sbin/modprobe $mod || true
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done
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''
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}
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# Restore the sound state.
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${alsaUtils}/sbin/alsactl -f ${soundState} restore || true
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'';
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postStop =
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''
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# Save the sound state.
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${alsaUtils}/sbin/alsactl -f ${soundState} store
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'';
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};
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};
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}
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