[CentOS] Mic Plugged into sound card not working

Mark LaPierre marklapier at aol.com
Wed Jan 18 01:10:07 UTC 2012


On 01/16/2012 07:11 PM, Mark LaPierre wrote:
> Hey guys,
>
> I have a mic plugged into my sound card.  It worked late last night but
> not today.  When I try to select the mic using System/Preferences/Sound
> I'm provided with several options to choose from.
>
> On the Hardware tab I choose the Internal Audio device and set it to
> Analog Stereo Duplex.
>
> On the Input tab I choose Internal Audio Analog Stereo there are two
> Analog Microphone Inputs, 1 and 2, to choose from.  Each of those inputs
> has Microphone 1 and 2 to choose from.
>
> When I try to record from the mic in Audacity I get a flat signal if I
> choose Input 1 no matter which Microphone, 1 or 2, I choose.
>
> If I choose Input 2, no matter which Microphone I choose, the wave form
> freezes until I return the selection to Input 1.
>
> alsamixer -c0 does not indicate any input settings being muted.  In fact
> its indications change in response to changes in Sound Preferences and
> Sound Preferences indications change in response to changes in alsamixer
> -c0.
>
> CentOS 6.2
>
> Advanced Linux Sound Architecture Driver Version 1.0.21
>
> /proc/asound/cards
> 0 [V8237          ]: VIA8237 - VIA 8237
>                        VIA 8237 with ALC655 at 0xd400, irq 22
>
> /proc/asound/devices
>     2:        : timer
>     3:        : sequencer
>     4: [ 0- 1]: digital audio playback
>     5: [ 0- 1]: digital audio capture
>     6: [ 0- 0]: digital audio playback
>     7: [ 0- 0]: digital audio capture
>     8: [ 0]   : control
>     9: [ 1- 0]: digital audio capture
>    10: [ 1]   : control
>    11: [ 2- 0]: digital audio playback
>    12: [ 2- 0]: digital audio capture
>    13: [ 2]   : control
>
> /proc/asound/pcm
> 00-00: VIA 8237 : VIA 8237 : playback 4 : capture 1
> 00-01: VIA 8237 : VIA 8237 : playback 1 : capture 1
> 01-00: USB Audio : USB Audio : capture 1
> 02-00: USB Audio : USB Audio : playback 1 : capture 1
>
> I tested the mic by plugging it into my wife's XP machine.  The mic
> works fine but the XP machine doesn't.
>
> Very frustrated.  Anyone have any idea what else I can check?
>

Alright, I guess I asked the wrong question.  Is there a way to probe 
the sound card so that I can figure out where in the software chain the 
problem is?  I suspect an issue with some library file somewhere but I 
don't know how to tell what library I hosed up.

-- 
     _
    °v°
   /(_)\
    ^ ^  Mark LaPierre
Registerd Linux user No #267004



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