reset sound after suspend to memory (deep sleep)

[Der Geist der Maschine]

Hello Syonyk

I've been able to reset audio (on Ubuntu 20.04, mainline 5.7 kernel) after a deep sleep with the following:

Code:

pulseaudio -k && sudo alsa force-reload

I believe it accomplishes similar things.  On the other hand, it doesn't work if something is trying to play music, but neither does it crash the kernel.

Ubuntu's alsa script is unloading and then reloading all sound related drivers. That does not work for me on stock Manjaro 20.06.

Great that the alsa script works for you. I assume ubuntu uses systemd , so you should not run pulseaudio -k, but something along these lines

Code:

$ systemctl --user stop pulseaudio.socket
$ sudo alsa force-reload
$ systemctl --user start pulseaudio

You can check with lsof if the sound device is in use (maybe there is a better way?)

Code:

$ lsof /dev/snd/*
COMMAND    PID    USER  FD  TYPE DEVICE SIZE/OFF  NODE NAME
pulseaudi 73457 manjaro  mem    CHR  116,2          478461 /dev/snd/pcmC0D0p
pulseaudi 73457 manjaro    20u  CHR  116,4      0t0 478465 /dev/snd/controlC0
pulseaudi 73457 manjaro    21r  CHR 116,33      0t0    47 /dev/snd/timer
pulseaudi 73457 manjaro    22u  CHR  116,2      0t0 478461 /dev/snd/pcmC0D0p
pulseaudi 73457 manjaro    37u  CHR  116,4      0t0 478465 /dev/snd/controlC0

Your command pulseaudio -k is killing pulseaudio, but systemd monitors it and restarts it. So maybe your alsa command is sometimes too slow. Try my systemd commands. I expect its not necessary to stop playing audio. The systemd commands will take care of it and stop playing audio.