CentOS - May 2014 - plug in phones, speaker does not mute.

Hi all!

Using C6 on an Asus M5A99X EVO R2.0 motherboard with AMD six core FX6300.
That board uses Realtek ALC892 audio chipset.

For the first time since I got that motherboard I tried plugging in
headphones to the front panel speaker output. I was somewhat displeased
to note that the speakers don't mute when that happens.

I recall seeing info on that in Fedora, but not Centos, and haven't
so far scared up how to troubleshoot it.

I can MANUALLY change the setting in sound preferences, which offers
only two choices: "Analog Output" and "Analog Headphones".

Suggestions will be welcomed!

Fred
-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us
-----------------------------
                      The eyes of the Lord are everywhere, 
                    keeping watch on the wicked and the good.
----------------------------- Proverbs 15:3 (niv) -----------------------------

Fred Smith <fredex at ...> writes:
> 
> Hi all!
> 
> Using C6 on an Asus M5A99X EVO R2.0 motherboard with AMD six core FX6300.
> That board uses Realtek ALC892 audio chipset.
> 
> For the first time since I got that motherboard I tried plugging in
> headphones to the front panel speaker output. I was somewhat displeased
> to note that the speakers don't mute when that happens.
> 
> I recall seeing info on that in Fedora, but not Centos, and haven't
> so far scared up how to troubleshoot it.
> 
> I can MANUALLY change the setting in sound preferences, which offers
> only two choices: "Analog Output" and "Analog
Headphones".
> 
> Suggestions will be welcomed!
> 
> Fred
Might have a look at amixer and see if you have an option you can alter
similar to:

Simple mixer control 'Auto-Mute Mode',0
  Capabilities: enum
  Items: 'Disabled' 'Speaker Only' 'Line Out+Speaker'
  Item0: 'Line Out+Speaker'

And see if you can set it ala:

/usr/bin/amixer -c0 set "Auto-Mute Mode" "Line Out+Speaker"

-Matthew Gillespie