alsa-utils/alsactl/90-alsa-restore.rules.in

ACTION=="add", SUBSYSTEM=="sound", KERNEL=="controlC*", KERNELS=="card*", \
        RUN+="@sbindir@/alsactl restore $attr{number}"
alsactl: systemd and udev hookup Add minimal systemd and udev support to alsactl so that mixer settings are restored at boot, when sound cards are plugged in and saved on shutdown. This is similar to existing udev/init script solutions in various distributions. Note that alsactl is called both synchronously from the udev rules as well as asynchronously at boot. This is intended, and to ensure two things: - At boot the asound.state file might not be readable, since it resides on a different file system. That means exclusively restoring sound card settings from udev rules will no suffice, since if the rule is executed at early boot (for example within udev settle) then the file will no be readable and cannot be restored. - We need to ensure that applications monitoring sound cards coming and going (such as PA) must not get these events before the mixer settings have been restored. That means the mixer settings must be restored synchronously withing the udev rules, before the events are passed on to the apps. That basically means we need to restore the settings once in udev, to deal with sound cards becoming available during runtime. And once in early boot to deal with coldplugged soundcards whose data files might not have been available at time of plugging. Hence we call alsactl twice: one from the udev rule, and once from he systemd unit file. Signed-off-by: Lennart Poettering <mznyfn@0pointer.de> Signed-off-by: Jaroslav Kysela <perex@perex.cz> 2010-11-23 01:45:08 +01:00			`ACTION=="add", SUBSYSTEM=="sound", KERNEL=="controlC", KERNELS=="card", \`
			`RUN+="@sbindir@/alsactl restore $attr{number}"`