[pulseaudio-tickets] [Bug 91471] New: Pulseaudio enables Surround 4.0, while chmap reports no RL and RR

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91471

            Bug ID: 91471
           Summary: Pulseaudio enables Surround 4.0, while chmap reports
                    no RL and RR
           Product: PulseAudio
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: pavucontrol
          Assignee: pulseaudio-bugs at lists.freedesktop.org
          Reporter: arthurborsboom at gmail.com
        QA Contact: pulseaudio-bugs at lists.freedesktop.org
                CC: lennart at poettering.net

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:
http://permalink.gmane.org/gmane.linux.alsa.devel/141974

Here is the whole conversation:
http://comments.gmane.org/gmane.linux.alsa.devel/140852

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:
http://www.alsa-project.org/db/?f=ab56d544c53402fc7fdb96956299753de2708a6f

Pulseaudio verbose log: http://pastebin.com/MwC3KQS5

How would you suggest to analyze and/or fix this issue?

-- 
You are receiving this mail because:
You are the QA Contact for the bug.
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.freedesktop.org/archives/pulseaudio-bugs/attachments/20150727/8b1197eb/attachment.html>