Bristol Digest, Vol 637, Issue 1

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Today's Topics:

1. NO SOUND ON MINT 17.1 WITH INTEL CAED (John Cleave)


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Message: 1
Date: Mon, 14 Mar 2016 14:13:21 +0000 (GMT)
From: John Cleave <drjazz@blueyonder.co.uk>
To: Bristol and Bath Group <bristol@mailman.lug.org.uk>
Subject: [bristol] NO SOUND ON MINT 17.1 WITH INTEL CAED
Message-ID:
<920935033.2940097.1457964801783.JavaMail.open-xchange@oxbe8.tb.ukmail.iss.as9143.net>

Content-Type: text/plain; charset="utf-8"

I have a serious problem with "no sound" on my engine. Could someone please
help.

Here is what occurs: DVD plays (via VLC). Video OK, audio u/s. WHY?
I tried using a "music file" M.wav:
$cat M.wav > /dev/snd/pcmC0D0
gives "Permission denied ...". But
$cat M.wav
gives garbage screen (so M.wav OK)
Importing M.wav into Audacity and "play" shows wave-form and active i/p monitor
but unactivated o/p monitor under either "pulse" or "default" settings.

Web hits suggest permissions problems, others go for Intel driver and sound
cards.

My relevant setup(?):
CARDS:(1) alsamixer shows "card HDA Intel; Chip Intel ID 2809"
(2)/proc/asound/cards contains the line
"HDA Intel at 0xdf1200000 irq 14"
DEVICES: (1) /dev/snd contains the lines
"drwxr-xr-x 2 root root <date> 1 <time> by-path
crw-rw----+ 1 root audio 116 "........." <device name>
where device names are "controlC0, hwC0D0, hwC0D2, pcmC0D0c, pcmC0D0p, pcmC0D1p
pcmC0D2c, pcmC0D3p, seq,timer."
(2) lspci contains a line:
"Audio device. Intel Corporation Device a123 (rev 31)"
(3) /proc/asound contains items ? card0, card, Intel, modules ?
each of which has "root root" access, in contrast to /dev/snd info.
PERMISSIONS: /etc/group contains the lines:
"root:x:0,...sudo:x:27,...audio:x:29:pulse,<username>,...pulse:x:117,...
pulse-access:x:118,...<username>:x:1000"

Another web hit suggests that there is a bug with the card and the snd-hda-intel
drive: "try to add
the line
"options snd-hda-intel model = auto"
at the very end of the alsa-base.conf file (in /etc/modprobe.d/ )". An attempt
at copying this file
was frustrated by "sorry, user <username> is not allowed to execute ... as root
on machine
<machine name>." The file can be "catted" to gedit but there is no permission to
save.

Now stuck. Thanks, John Cleave.
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