[CentOS] Headphones volume control not working in CentOS 7

Sun Jul 30 20:37:28 UTC 2017
Bernard Lheureux <bernard.lheureux at bbsoft4.org>

On 29/07/2017 02:15, Fred Smith wrote:

Anybody have the same problem that I have with JACK plugged headphones 
(analogic) ?
The volume controls on the cable of the headphones do not work on CentOS 
7 on my Lenovo Thinkpad T530...
How could I solve this ?

> On Sat, Jul 29, 2017 at 12:28:40AM +0200, Bernard Lheureux wrote:
>> Hi all,
>> I hope someone could enlighten me...
>> How could I resolve the fact that the volume controls of all the
>> headphones I try on CentOS 7 are not working, they are OK on CentOS
>> 6 but impossible to make them work on my Thinkpad Laptop with an
>> iPhone headphones or a Marshal Monitor plugged with a jack
>> connector...
>> Those 2 headphones work correctly in CentOS 6...
>> What could I do to get the same behavior on CentOS 7 and this damned
>> Gnome 3 ?
>> Thanks for your help...
> On Centos-7, some apps use PulseAudioVolumeControl (pavucontrol)
> instead of the one that defaults to the top panel. (I am running
> Mate, not Gnome--yuck--so YMMV).
> I wish there was a way to control all from a single place, but AFAICF
> there isn't. for some things I use the one on the top panel (which is
> Mate Volume Control) and for others I gotta start up pavucontrol.
> it's a nuisance.
> My USB phones seem to be controlled by the pavu control, while the
> speakers tend to be controlled by the mate volume control. and I can't
> get my old analog (1/8 inch plug) headphones to work at all anymore,
> no matter what control I use or how I poke at it, all the sound comes
> from the speakers (which are plugged into the line out [green} jack
> on the rear of the computer, while the headphones are plugged into the
> green jack on the front.)
> digressing a little... A few years ago my systems all supported
> auto-switching between speakers and headphones when the phone plug
> was inserted, but the only one I have now that does that is my netbook.
> the current desk-side system and its last couple of predecessors now
> do not do that. Go figure.

(°-	Bernard Lheureux
//\     Linux System Administrator
v_/_    MailTo:bernard at lheureux.be