/lib/systemd/system/alsa-restore.service is in alsa-utils 1.0.27.2-1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | #
# Note that two different ALSA card state management schemes exist and they
# can be switched using a file exist check - /etc/alsa/state-daemon.conf .
#
[Unit]
Description=Restore Sound Card State
ConditionPathExists=!/var/lib/alsa/state-daemon.conf
ConditionPathExists=/var/lib/alsa/asound.state
DefaultDependencies=no
After=alsa-state.service
Before=shutdown.target
Conflicts=shutdown.target
[Service]
Type=oneshot
ExecStart=-/usr/sbin/alsactl -E HOME=/var/run/alsa restore
StandardOutput=syslog
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