Re: [OxLUG] No sound when using Iceweasel

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Author: oxlug
To: Oxfordshire Linux User Group Discussion List
Subject: Re: [OxLUG] No sound when using Iceweasel

Some commands and responses :-

% cat /etc/asound.conf
pcm.!default {
        type hw
        card 0

ctl.!default {
        type hw
        card 1

% aplay --list-devices
**** List of PLAYBACK Hardware Devices ****
card 0: PCH [HDA Intel PCH], device 0: ALC887-VD Analog [ALC887-VD Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0
card 0: PCH [HDA Intel PCH], device 1: ALC887-VD Digital [ALC887-VD Digital]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 3: HDMI 0 [HDMI 0]
Subdevices: 1/1
Subdevice #0: subdevice #0
card 1: NVidia [HDA NVidia], device 7: HDMI 1 [HDMI 1]
Subdevices: 1/1
Subdevice #0: subdevice #0

% cat   /proc/asound/cards
 0 [PCH            ]: HDA-Intel - HDA Intel PCH
                      HDA Intel PCH at 0xf7210000 irq 45
 1 [NVidia         ]: HDA-Intel - HDA NVidia
                      HDA NVidia at 0xf7080000 irq 17

Am I right in thinking that the contents of /etc/asound.conf
indicate that pulseaudio is not being used, but ALSA alone
is used for the sound ?

Audio output is to a pair of speakers connected to the PC
via the normal headphone output from the PC.

Hence as I understand it, sound should be produced by card 0.

In addition, the YouTube sound has now suddenly re-appeared
without any obvious reason. This indicates a pattern of sound
suddenly disappearing without obvious reason and then suddenly
re-appearing days or perhaps weeks later. Could this problem
be due to certain programs suddenly stopping or restarting the sound ?


Mike Bailey

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27. Oct 2017 15:25 by :

>> I have a problem with no sound when using Iceweasel on a
>> Debian Jessie system. [ ... ]
> That is a bit generic: is sound otherwise available to
> applications? If a page has background audio can that be heard?
> Later you mention the Flash plugin, but a lot of sound comes
> with HTML5 pages nowadays, and the sound is not routed via the
> Flash plugin.
>> pcm.pulse {type pulse}ctl.pulse {type pulse}pcm.!default {type pulse}
> That might be instead (and just in '/etc/asound.conf'):
> ------------------------------------------------------------------------
> pcm.pulse       { type pulse; }
> ctl.pulse       { type pulse; }

> pcm.!default    { type pulse; fallback "sysdefault"; }
> ctl.!default    { type pulse; fallback "sysdefault"; }
> ------------------------------------------------------------------------

> But something like that should be the default...
> Usually to sort out sound issues it is necessary to start bottom
> up, first checking that the ALSA layer works (which includes
> checking that the default sound device is right and unmuted),
> then that PulseAudio layer works (which includes checking that
> the right ALSA device is the default, and it is unmuted), and
> then the application layer.
> For ALSA there is a troubleshooting list here:
> >
> For PulseAudio the best first approach is the GUI program
> 'pavucontrol' that allows checking that the appo output device
> selected is the right one (sometimes the default is "Null
> Output" or the sound card built into most HDMI GPUs), and that
> sound does get through (connection appears in "Playback" tab).