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.