[pulseaudio-discuss] Mic not working with PA

[remrot at gmail.com]

Hi!

 Thx for your response! I've attached the amixer output for the live system
(amixer_live.txt), the installed system with all options identical to the
live system (amixer_installed.txt) and the output for the installed system
using the probe_mask and position_fix options (amixer_posfix.txt). I see no
differences between the live and installed system other than the volume
settings. In the amixer_posfix output, the modem devices are missing because
of the probe_mask option.

One unusual thing I noticed when starting the installed system without the
additional options ist that the capture device is shown in alsamixer and
amixer. Most of the time, the capture device didn't even exist within the
installed system. And quite often the sound output didn't work too (as I
wrote on the ALSA list: it's kind of a sound-lottery). However, although
this time there was capture device, recording did not work. Gnome's
audi-recorder stopped directly after starting and crashed afterwards (same
error as usual). Seems like there wasn't anything to record, like an empty
stream of length 0...

I've done most of the live-tests using the karmic Alpha 6 live CD. The
installed system is the current karmic. Initially, both kernels were
identical, currently there is little difference:

The live system:

Linux ubuntu 2.6.31-10-generic #34-Ubuntu SMP Wed Sep 16 00:23:19 UTC 2009
i686 GNU/Linux

The installed system:

Linux andicompi 2.6.31-11-generic #36-Ubuntu SMP Fri Sep 25 06:37:51 UTC
2009 i686 GNU/Linux


Regards

JK


2009/9/30 Lennart Poettering <lennart at poettering.net>

> On Fri, 25.09.09 13:11, remrot at gmail.com (remrot at gmail.com) wrote:
>
> > Hi again!
> >
> >  I found a workaround for the dead mic: adding 'position_fix=1' to the
> > option list brought it back to life! However, it's still different from
> > within the live system. The recorded stream is very quiet and contains
> > significant noise, unlike in the live system where volume and quality
> were
> > very good, even with the capture device almost muted! So, it still
> remains a
> > very strange bug and I wrote another mail to the ALSA developer list
> > containing additional information collected with their info-script. You
> can
> > take a look at it there if you like (the devel, not the users list). I'm
> > curious if I'll ever get a response...
>
> The output of "amixer -c0" on the live medium and the installation
> might be very interesting. This should tell us why decibel works on
> one, but not on the other.
>
> Are kernels used any different? What does "uname -a" say on both systems?
>
> Lennart
>
> --
> Lennart Poettering                        Red Hat, Inc.
> lennart [at] poettering [dot] net
> http://0pointer.net/lennart/           GnuPG 0x1A015CC4
> _______________________________________________
> pulseaudio-discuss mailing list
> pulseaudio-discuss at mail.0pointer.de
> https://tango.0pointer.de/mailman/listinfo/pulseaudio-discuss
>
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Simple mixer control 'Master',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 220 [86%] [-7.00dB]
  Front Right: Playback 220 [86%] [-7.00dB]
Simple mixer control 'Front',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'CD',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 23
  Mono:
  Front Left: Playback 5 [22%] [-21.00dB] [on]
  Front Right: Playback 5 [22%] [-21.00dB] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 23
  Mono:
  Front Left: Playback 0 [0%] [-36.00dB] [off]
  Front Right: Playback 0 [0%] [-36.00dB] [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 13
  Front Left: Capture 11 [85%] [27.00dB] [on]
  Front Right: Capture 11 [85%] [27.00dB] [on]
Simple mixer control 'Beep',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 15
  Mono:
  Front Left: Playback 15 [100%] [0.00dB] [off]
  Front Right: Playback 15 [100%] [0.00dB] [off]
Simple mixer control 'Caller ID',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Mic' 'CD'
  Item0: 'Mic'
Simple mixer control 'Off-hook',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
-------------- next part --------------
Simple mixer control 'Master',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 255 [100%] [0.00dB]
  Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Front',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'CD',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 23
  Mono:
  Front Left: Playback 19 [83%] [21.00dB] [on]
  Front Right: Playback 19 [83%] [21.00dB] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 23
  Mono:
  Front Left: Playback 0 [0%] [-36.00dB] [off]
  Front Right: Playback 0 [0%] [-36.00dB] [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 13
  Front Left: Capture 0 [0%] [-6.00dB] [on]
  Front Right: Capture 0 [0%] [-6.00dB] [on]
Simple mixer control 'Beep',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 15
  Mono:
  Front Left: Playback 15 [100%] [0.00dB] [off]
  Front Right: Playback 15 [100%] [0.00dB] [off]
Simple mixer control 'Caller ID',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Mic' 'CD'
  Item0: 'Mic'
Simple mixer control 'Off-hook',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [off]
-------------- next part --------------
Simple mixer control 'Master',0
  Capabilities: pswitch pswitch-joined
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 255
  Mono:
  Front Left: Playback 220 [86%] [-7.00dB]
  Front Right: Playback 220 [86%] [-7.00dB]
Simple mixer control 'Front',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
Simple mixer control 'CD',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 23
  Mono:
  Front Left: Playback 15 [65%] [9.00dB] [on]
  Front Right: Playback 15 [65%] [9.00dB] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 23
  Mono:
  Front Left: Playback 0 [0%] [-36.00dB] [off]
  Front Right: Playback 0 [0%] [-36.00dB] [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 13
  Front Left: Capture 11 [85%] [27.00dB] [on]
  Front Right: Capture 11 [85%] [27.00dB] [on]
Simple mixer control 'Beep',0
  Capabilities: pvolume pswitch
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 15
  Mono:
  Front Left: Playback 12 [80%] [-9.00dB] [off]
  Front Right: Playback 12 [80%] [-9.00dB] [off]
Simple mixer control 'Input Source',0
  Capabilities: cenum
  Items: 'Mic' 'CD'
  Item0: 'Mic'