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Linux - Embedded & Single-board computer This forum is for the discussion of Linux on both embedded devices and single-board computers (such as the Raspberry Pi, BeagleBoard and PandaBoard). Discussions involving Arduino, plug computers and other micro-controller like devices are also welcome.

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Old 09-09-2016, 12:30 PM   #1
lambo69
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Registered: Sep 2012
Distribution: Slackware, Manjaro, Slackarm, Raspbian, Debian
Posts: 63

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Raspberry Pi3, Alsa, Slackarm.14.2


Hi,
i'm in trouble getting sound to work on a RaspberryPi 3 running slackarm 14.2.

Quote:
> lsmod |grep snd
snd_bcm2835 20319 0
snd_pcm 75532 1 snd_bcm2835
snd_timer 19156 1 snd_pcm
snd 52074 3 snd_bcm2835,snd_timer,snd_pcm
...module is loaded via rc.local, it didn't load by default.

...starting alsa manually:
Quote:
> /etc/rc.d/rc.alsa restart
Setting default ALSA mixer settings.
amixer: Mixer attach default error: No such file or directory
Storing default ALSA mixer settings: /usr/sbin/alsactl store
/usr/sbin/alsactl: save_state:1595: No soundcards found...
so let's have closer look:
Quote:
~> cat /proc/asound/cards
--- no soundcards ---
Hu?

alsamixer tells the same, no device...
and
Quote:
aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
pulse
PulseAudio Sound Server
Which brings me to the question: where is pulse started? rc.pulseaudio is not executable and the belonging section in rc.M is excluded. Udev? I didn' find anything looking like a rule to start pulseaudio. But:
Quote:
> ps ax|grep pulse
2186 pts/0 S+ 0:00 grep pulse
doesn't show anything of pulse. So why is pulseaudio be shown?

So my goal is simply to run alsa (not pulse) and use 3,5 jack. But first of all: getting alsa to run.

Are there any ideas?

thanks in advance

Last edited by lambo69; 09-09-2016 at 12:32 PM.
 
Old 09-11-2016, 03:07 AM   #2
lambo69
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Registered: Sep 2012
Distribution: Slackware, Manjaro, Slackarm, Raspbian, Debian
Posts: 63

Original Poster
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First of all: i wasn't aware of slackware14.2 being shipped with pulseaudio as default.

To get the soundcard (slackarm only):
Set at /boot/config.txt
Quote:
dtparam=audio=on
and, solely to set 3.5mm jack as default:
Quote:
hdmi_drive=1
Next, the module of the soundcard has to be loaded:
append to /etc/rc.d/rc.local
Quote:
modprobe snd_bcm2835
...but there are other places to load it.

That was the raspberry part. To get back alsa to slackware, do the following:

Prevent audio from being routed by default to pulse, this happens at /etc/asound.conf:
Code:
mv /etc/asound.conf /etc/asound.conf.bak
Prevent pulseaudio from being started again, when killed, edit /etc/pulse/client.conf to the following:
Quote:
autospawn = no
allow-autospawn-for-root = no
daemon-binary = /usr/bin/true
revoke executionflag on /etc/rc.d/rc.pulseaudio
Code:
chmod 444 /etc/rc.d/rc.pulseaudio
make /etc/rc.d/rc.alsa executable:
Code:
chmod 544 /etc/rc.d/rc.alsa
For the slackware part of getting rid of pulseaudio, there are some more threads about it here on LQ.
 
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