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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - incoherent muting of GStreamer channels (mutes master, headphone and speaker, but unmutes only master)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79911">79911</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>lennart@poettering.net
</td>
</tr>
<tr>
<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Summary</th>
<td>incoherent muting of GStreamer channels (mutes master, headphone and speaker, but unmutes only master)
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>horst@schirmeier.com
</td>
</tr>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
</tr>
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<th>Component</th>
<td>misc
</td>
</tr>
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<th>Product</th>
<td>PulseAudio
</td>
</tr></table>
<p>
<div>
<pre>This is a summary of the Ubuntu bug reported at
<<a href="https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1254884">https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1254884</a>>. It
already has a duplicate at
<<a href="https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1258782">https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1258782</a>>.
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
<<a href="https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1254884">https://bugs.launchpad.net/ubuntu/+source/xfce4-volumed/+bug/1254884</a>> we
posted the "alsa-info" for a few systems with similar symptoms.
- In <a href="show_bug.cgi?id=79911#c28">comment #28</a> 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
----</pre>
</div>
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