GNU bug report logs - #31591
alsamixer Cannot open shared library libasound_module_ctl_pulse.so

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Oleg Pykhalov <go.wigust <at> gmail.com>
Subject: bug#31591: closed (Re: [bug#31934] [PATCH] services: sound:
 Properly handle alsa-plugins.)
Date: Mon, 25 Jun 2018 15:36:03 +0000

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Your bug report

#31591: alsamixer Cannot open shared library libasound_module_ctl_pulse.so

which was filed against the guix package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 31591 <at> debbugs.gnu.org.

-- 
31591: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=31591
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: iyzsong <at> member.fsf.org (宋文武)
To: Oleg Pykhalov <go.wigust <at> gmail.com>
Cc: Julien Lepiller <julien <at> lepiller.eu>, 31934 <at> debbugs.gnu.org,
 31591-done <at> debbugs.gnu.org
Subject: Re: [bug#31934] [PATCH] services: sound: Properly handle alsa-plugins.
Date: Mon, 25 Jun 2018 23:34:13 +0800

Oleg Pykhalov <go.wigust <at> gmail.com> writes:

> Hello,
>
> iyzsong <at> member.fsf.org (宋文武) writes:
>
>> Julien Lepiller <julien <at> lepiller.eu> writes:
>
> […]
>
>> Hello, after some hours of searching...  I found that we can use the
>> 'lib' option in 'pcm_type' and 'ctl_type' to specify the library path
>> for alsa plugins, e.g:
>
> Thats a nice hack :-)  Thank you for working on this.
>
> […]
>
>> So I think we can make our 'alsa-service' do this, instead of patching
>> alsa-lib for 'ALSA_PLUGIN_DIR'.
>
> Done.  Here is a patch which I tested on my machine by ‘system reconfigure’:
>

Thank you, I modified it to keep the 'pulseaudio? #f' function, and
pushed :-)

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From: Oleg Pykhalov <go.wigust <at> gmail.com>
To: bug-guix <at> gnu.org
Subject: alsamixer Cannot open shared library libasound_module_ctl_pulse.so
Date: Fri, 25 May 2018 14:18:37 +0300

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Hello Guix,

The alsa-service-type service produces /etc/asound.conf with content:
--8<---------------cut here---------------start------------->8---
# Generated by 'alsa-service'.

# Use PulseAudio by default
pcm.!default {
  type pulse
  fallback "sysdefault"
  hint {
    show on
    description "Default ALSA Output (currently PulseAudio Sound Server)"
  }
}

ctl.!default {
  type pulse
  fallback "sysdefault"
}
--8<---------------cut here---------------end--------------->8---

This config brokes alsamixer utility (removing asound.conf fixes issue):

$ alsamixer
--8<---------------cut here---------------start------------->8---
ALSA lib dlmisc.c:287:(snd1_dlobj_cache_get) Cannot open shared library /gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/alsa-lib/libasound_module_ctl_pulse.so ((null): /gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/alsa-lib/libasound_module_ctl_pulse.so: cannot open shared object file: No such file or directory)
cannot open mixer: No such device or address
--8<---------------cut here---------------end--------------->8---

alsa-lib doesn't contain libasound_module_ctl_pulse.so

$ find /gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib
--8<---------------cut here---------------start------------->8---
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/libasound.so
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/libasound.la
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/libasound.so.2
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/pkgconfig
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/pkgconfig/alsa.pc
/gnu/store/98fa0av6rsj9kzrhdw45n9k53gp0d4dg-alsa-lib-1.1.6/lib/libasound.so.2.0.0
--8<---------------cut here---------------end--------------->8---

but alsa-plugins:pulseaudio does

$ find /gnu/store/cfz7jvkzp3k2ginvzz35pyp7zffabksk-alsa-plugins-1.1.6-pulseaudio | grep libasound_module_ctl_pulse.so
--8<---------------cut here---------------start------------->8---
/gnu/store/cfz7jvkzp3k2ginvzz35pyp7zffabksk-alsa-plugins-1.1.6-pulseaudio/lib/alsa-lib/libasound_module_ctl_pulse.so
--8<---------------cut here---------------end--------------->8---

Still after install alsa-utils and alsa-plugins:pulseaudio in my user
profile (I also have alsamixer in system profile), alsamixer cannot find
libasound_module_ctl_pulse.so

Oleg.

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