[pulseaudio-tickets] [Bug 79911] New: incoherent muting of GStreamer channels (mutes master, headphone and speaker, but unmutes only master)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79911

          Priority: medium
            Bug ID: 79911
                CC: lennart at poettering.net
          Assignee: pulseaudio-bugs at lists.freedesktop.org
           Summary: incoherent muting of GStreamer channels (mutes master,
                    headphone and speaker, but unmutes only master)
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: horst at schirmeier.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: misc
           Product: PulseAudio

This is a summary of the Ubuntu bug reported at
<https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1254884>.  It
already has a duplicate at
<https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1258782>.

With certain audio hardware (those where alsamixer shows separate "headphone"
and "speaker" channels) pressing of the mute button on laptop keyboards causes
mute of all three channels: master, headphone and speaker.  Pressing the button
again to unmute unmutes only the master channel, leaving headphone and speaker
muted.

Workaround: There is no other way than opening alsamixer in a terminal (or open
mixer controls from the applet) and manually clicking the two remaining
channels to unmute.

Details:

- We already tracked this down not to be an issue with ALSA or xfce4-volumed:
The problem also occurs using a different window manager, and it disappears
when deinstalling PulseAudio.

- This issue has already been seen on "Intel Corporation 82801I (ICH9 Family)
HD Audio Controller (rev 03)" (Dell Latitude E6400) and "Intel Corporation 7
Series/C210 Series Chipset Family High Definition Audio Controller (rev 04)".

- This issue appeared with Ubuntu 13.10 (AMD64), and persists in 14.04.  I
don't know which PulseAudio versions were involved.

- "Raymond" in the original bug report flooded the discussion with lots of
technical information I do not know how to act upon.  Maybe you do.

- In comments #15 to #18 on
<https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1254884> we
posted the "alsa-info" for a few systems with similar symptoms.

- In comment #28 I successfully implemented a fix (or workaround?) for the
problem on my machine:

----
[...] changing "switch" from "mute" to "on" under [Element PCM] in
/usr/share/pulseaudio/alsa-mixer/paths/analog-output.conf.common (see below)
did have an effect -- pressing the "mute" button now only mutes Master and
Headphone (not PCM anymore), pressing it again only unmutes Master. Changing
the same for [Element Headphone] in
/usr/share/pulseaudio/alsa-mixer/paths/analog-output-headphones.conf fixes the
Headphone mixer behaviour for me, too.

[Element PCM]
#switch = mute
switch = on
----

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