bug#35599: No sound most of the time (dummy output)

[sirgazil]

Hi,

I installed the GNU system in a real machine using the Guix 1.0 ISO installer 
(https://ftp.gnu.org/gnu/guix/guix-system-install-1.0.0.x86_64-linux.iso.xz).

When I play video or audio in the browser or in the desktop, I get no audio. 
The volume controls in the browser and desktop show the sound is not disabled. 
There are no errors about missing codecs or anything like that. The media 
plays, but there is no audio coming out from the speakers (which are on). Audio 
and speakers worked fine in the distro I was using before installing GNU with 
Guix. I posted this issue to help-guix 
(https://lists.gnu.org/archive/html/help-guix/2019-05/msg00107.html). This is 
what I've tried so far:

When I go to GNOME Settings → Sound, I get this:

https://multimedialib.files.wordpress.com/2019/05/dummy-output-gnu-guix-1.0.png

The name of the only device listed there corresponds to "Dummy output" in 
English. So, for some reason, the system is not detecting the real sound device.

Running:

    guix environment --ad-hoc alsa-utils
    alsamixer

displays this: 

https://multimedialib.files.wordpress.com/2019/05/alsamixer-guix-system-1.0.png

When I press F6 in alsamixer I see "(default)" selected, and there are no other 
options, except for an "enter device name..." option.

I get this behavior almost every time I start the machine. Only once, I started 
the machine and the speakers worked. The real sound device was displayed in 
"GNOME Settings → Sound", and GNOME would display information when I plugged 
some headphones.

However, I don't know why it worked that time. I thought it had worked because 
that day I didn't plugged the headphones before booting, but trying to 
reproduce the behavior, I went back to the beginning: No sound. No matter 
whether I restart with headphones unplugged, I haven't been able to get the 
sound device to be recognized again.


---
https://sirgazil.bitbucket.io/