Sound stopped working on both 14.04 and 15.04

[Kevin O'Gorman]

On Mon, Aug 24, 2015 at 10:42 AM, MR ZenWiz <mrzenwiz at gmail.com> wrote:

> On Mon, Aug 24, 2015 at 10:26 AM, Kevin O'Gorman <kogorman at gmail.com>
> wrote:
>
>> I need help finding the right control to use.
>>
>> On my main machine, sound is not muted.
>>
>> In both alsamixer and pavucontrol there are just 2 outputs listed:
>> built-in sound which is what I want, and HDMI which I don't want because
>> while my monitors have HDMI, they don't have speakers.  When I play sound,
>> only the HDMI one shows activity in pavucontrol.  I don't see a control to
>> turn that off and turn on builtin sound; both look like they're enabled but
>> only HDMI shows activity.
>>
>>
> To get the right output, you need to go into the pavucontrol Configuration
> tab and select the right profile (Digital Stereo..., which is your HDMI, or
> Analog Stereo Duplex, which is your m/b sound).  There may be several of
> each, so I go for the top-most one in each category.
>
> My issue with sound is a little trickier - it sounds like multiple inputs
> all colliding with each other and hanging, but I haven't found any control
> to fix it yet....
>
> HTH
> MR
>
>
>
Thanks!  SOLVED.  Sort of.

I had already discovered that my monitors have earphone jacks that work
okay.  I was at first unable to get sound from my mobo, but found that just
the "line out" jack is dead.  There is sound coming from REAR, LEFT and
RIGHT.  I'll have to find out what happened to line out, but REAR seems
quite usable, since my inputs are all ordinary stereo and not surround
sound.

Having found this out, it seems that it's impossible to have both the HDMI
and the mobo sound at the same time.  If one is working I can choose
configuration settings at will for the other without effecting any change.
But if I leave that other one enabled and disable the first (select OFF in
pavucontrol Configuration), suddenly sound starts going to the other
destination and stops going to the first one, even though the first one is
still marked as before.  I did not expect this, but it's entirely workable
for me, if a bit unintuitive.

What I'm left with is probably some sort of hardware glitch, which may not
even be worth fixing.

-- 
Kevin O'Gorman
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