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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Pulseaudio enables Surround 4.0, while chmap reports no RL and RR"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91471">91471</a>
</td>
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<th>Summary</th>
<td>Pulseaudio enables Surround 4.0, while chmap reports no RL and RR
</td>
</tr>
<tr>
<th>Product</th>
<td>PulseAudio
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>pavucontrol
</td>
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<th>Assignee</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>arthurborsboom@gmail.com
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>pulseaudio-bugs@lists.freedesktop.org
</td>
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<th>CC</th>
<td>lennart@poettering.net
</td>
</tr></table>
<p>
<div>
<pre>In an effort to get an external subwoofer and a headset to work on my Asus
N751JK laptop, I have started working with the Alsa devs.
After applying an Alsa patch to the Linux mainline kernel v4.2.0-rc3, an alsa
developer believes one of the issues is a bug in Pulseaudio, see his statement
at the end of this conversation:
<a href="http://permalink.gmane.org/gmane.linux.alsa.devel/141974">http://permalink.gmane.org/gmane.linux.alsa.devel/141974</a>
Here is the whole conversation:
<a href="http://comments.gmane.org/gmane.linux.alsa.devel/140852">http://comments.gmane.org/gmane.linux.alsa.devel/140852</a>
Apparently on my laptop the Alsa-lib test tool 'chmap' shows the following
channels:
Type = FIXED, Channels = 2
FL FR
Type = FIXED, Channels = 4
FL FR NA LFE
Pulseaudio (or pavucontrol) shows Stereo, Surround 2.1 and Surround 4.0.
However, according to the alsa dev the Surround 4.0 option should not be there
since there are no Rear Left and Rear Right speakers.
Alsa-info:
<a href="http://www.alsa-project.org/db/?f=ab56d544c53402fc7fdb96956299753de2708a6f">http://www.alsa-project.org/db/?f=ab56d544c53402fc7fdb96956299753de2708a6f</a>
Pulseaudio verbose log: <a href="http://pastebin.com/MwC3KQS5">http://pastebin.com/MwC3KQS5</a>
How would you suggest to analyze and/or fix this issue?</pre>
</div>
</p>
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