Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4)

From	Paul Dufresne <dufresnep@gmail.com>
Newsgroups	linux.debian.user
Subject	Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4)
Date	2017-01-10 04:00 +0100
Message-ID	<sXUPf-3V1-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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That's on a laptop I installed Jessie on today.
In XFCE 4 (no reason to believe it is specific to that desktop
interface), when I pressed mute key (F7), indeed the sound
goes off. But afer that, pressing again F7 did not unmute, nor Volume
up or down key.

When I have gone in Mixer application, I saw that Mute was muting Main
and Speaker Channel.
Unmute was unmuting Main channel, but leaving Speaker channel muted.
Manually unmuting Speaker works, giving back the sound.

I looked in Parameters/Keyboard, then look at keyboard settings, but
there was no F7 key (or F8 key for up or down volume).

I have seen that list-acpi, was showing the event... but I don't
really understand where the actions are taken.

I even do have visual feedback when doing volume up or down on the screen.

But somehow would like to fix the unmute, not unmuting speaker channel
and don't know where to look.

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Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4) Paul Dufresne <dufresnep@gmail.com> - 2017-01-10 04:00 +0100
  Re: Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4) Stefan Monnier <monnier@iro.umontreal.ca> - 2017-01-10 04:50 +0100
    Re: Mute mutes speaker, but Unmute does not unmute speaker channel  (XFCE4) Jude DaShiell <jdashiel@panix.com> - 2017-01-10 06:50 +0100
      Re: Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4) Stefan Monnier <monnier@iro.umontreal.ca> - 2017-01-10 07:00 +0100
        Re: Mute mutes speaker, but Unmute does not unmute speaker channel  (XFCE4) Jude DaShiell <jdashiel@panix.com> - 2017-01-10 07:50 +0100
          Re: Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4) Paul Dufresne <dufresnep@gmail.com> - 2017-01-10 12:40 +0100
            Re: Mute mutes speaker, but Unmute does not unmute speaker channel (XFCE4) Paul Dufresne <dufresnep@gmail.com> - 2017-01-10 13:10 +0100

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