<p><br>
><br>
> Alsa-info patched kernel: <a href="http://www.alsa-project.org/db/?f=cd23a3f0bb72e38d73224620e3e8ab57a73aa441">http://www.alsa-project.org/db/?f=cd23a3f0bb72e38d73224620e3e8ab57a73aa441</a><br>
><br>
> Chmap results:<br>
><br>
> Type = FIXED, Channels = 2<br>
>   FL FR<br>
> Type = FIXED, Channels = 4<br>
>   FL FR NA LFE<br>
>  <br>
> When unplugging the subwoofer, then chmap gives this and stays like this.<br>
><br>
> Cannot open PCM stream hw:1 for PLAYBACK<br>
><br>
> [Pavucontrol] -> [Configuration] -> [Built-in Audio] gives<br>
><br>
> Analog Stereo Duplex<br>
> Analog Stereo Output<br>
> Analog Surround 2.1 Output + Analog Stereo Input<br>
> Analog Surround 2.1 Output <br>
> Analog Surround 4.0 Output + Analog Stereo Input<br>
> Analog Surround 4.0 Output <br>
> Analog Stereo Input<br>
> Off</p>
<p>Seem pulseaudio bug since your laptop does not have surround40 chmap</p>
<p>It is not clear how pulseaudio's 21 channel-map match with alsa's 2.1 chmap </p>
<p><a href="http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/profile-sets/default.conf">http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/profile-sets/default.conf</a></p>
<p>[Mapping analog-surround-21]<br>
device-strings = surround21:%f<br>
channel-map = front-left,front-right,lfe<br>
paths-output = analog-output analog-output-lineout analog-output-speaker<br>
priority = 8<br>
direction = output</p>
<p>[Mapping analog-surround-40]<br>
device-strings = surround40:%f<br>
channel-map = front-left,front-right,rear-left,rear-right<br>
paths-output = analog-output analog-output-lineout analog-output-speaker<br>
priority = 7<br>
direction = output<br>
><br>
> Pulseaudio verbose log while plugging in the subwoofer: <a href="http://pastebin.com/Ya5u1qz6">http://pastebin.com/Ya5u1qz6</a></p>
<p><a href="https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio">https://bugs.freedesktop.org/enter_bug.cgi?product=PulseAudio</a><br>
</p>