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antares7 08-17-2011 07:17 AM

Quiet microphone problems
 
I have some problems with my audio hardware. Fedora 15
Code:

Linux antares 2.6.40-4.fc15.i686.PAE #1 SMP Fri Jul 29 18:47:58 UTC 2011 i686 i686 i386 GNU/Linux
Audio is:
Code:

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01)
        Subsystem: IBM Device 030e
        Flags: bus master, fast devsel, latency 0, IRQ 43
        Memory at d01c0000 (64-bit, non-prefetchable) [size=16K]
        Capabilities: [50] Power Management version 2
        Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [70] Express Root Complex Integrated Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [130] Root Complex Link
        Kernel driver in use: HDA Intel
        Kernel modules: snd-hda-intel

Audio playback works fine, but there was no response from the mic (using headphones, which were tested on another PC, working fine). Using "alsamixer -c0" I unmuted and set to maximum volume everything I was able to, and thus I was able to hear microphone sound in the headphones clear enough (blowing against, taping the mic produced loud enough sound). Although when I tried test call on skype, or sound recorder - the recorded sound was very quiet, and with a lot of static and sound interference. About skype - I tried with and without allowing skype to autoadjust sound, I tried playing with sound preferences (changing the connector, device used), also installed pulse audio volume control, alsamixer, tried to play with them to no avail.

I hope you can help me with this issue. Thank you in advance!

I'll provide more info, if it can give information:
Code:

[root@antares antares]# amixer -c0
Simple mixer control 'Master',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 63
  Mono: Playback 63 [100%] [0.00dB] [on]
Simple mixer control 'Headphone',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 63
  Mono:
  Front Left: Playback 63 [100%] [3.00dB] [on]
  Front Right: Playback 63 [100%] [3.00dB] [on]
Simple mixer control 'PCM',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono:
  Front Left: Playback 28 [90%] [7.50dB] [on]
  Front Right: Playback 28 [90%] [7.50dB] [on]
Simple mixer control 'Front',0
  Capabilities: pvolume pswitch penum
  Playback channels: Front Left - Front Right
  Limits: Playback 0 - 63
  Mono:
  Front Left: Playback 0 [0%] [-91.50dB] [off]
  Front Right: Playback 0 [0%] [-91.50dB] [off]
Simple mixer control 'Front Mic',0
  Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Playback channels: Front Left - Front Right
  Capture channels: Mono
  Limits: Playback 0 - 31
  Mono: Capture [off]
  Front Left: Playback 31 [100%] [12.00dB] [on]
  Front Right: Playback 31 [100%] [12.00dB] [on]
Simple mixer control 'Front Mic Boost',0
  Capabilities: volume penum
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 3 [100%] [30.00dB]
  Front Right: 3 [100%] [30.00dB]
Simple mixer control 'Line',0
  Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Playback channels: Front Left - Front Right
  Capture channels: Mono
  Limits: Playback 0 - 31
  Mono: Capture [off]
  Front Left: Playback 27 [87%] [6.00dB] [on]
  Front Right: Playback 27 [87%] [6.00dB] [on]
Simple mixer control 'CD',0
  Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Playback channels: Front Left - Front Right
  Capture channels: Mono
  Limits: Playback 0 - 31
  Mono: Capture [off]
  Front Left: Playback 23 [74%] [0.00dB] [on]
  Front Right: Playback 23 [74%] [0.00dB] [on]
Simple mixer control 'Mic',0
  Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Playback channels: Front Left - Front Right
  Capture channels: Mono
  Limits: Playback 0 - 31
  Mono: Capture [on]
  Front Left: Playback 24 [77%] [1.50dB] [on]
  Front Right: Playback 24 [77%] [1.50dB] [on]
Simple mixer control 'Mic Boost',0
  Capabilities: volume penum
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 3
  Front Left: 3 [100%] [30.00dB]
  Front Right: 3 [100%] [30.00dB]
Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'IEC958 Default PCM',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [on]
Simple mixer control 'IEC958 Playback Source',0
  Capabilities: enum
  Items: 'PCM' 'ADC'
  Item0: 'PCM'
Simple mixer control 'Beep',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 15
  Mono: Playback 8 [53%] [-21.00dB] [on]
Simple mixer control 'Aux',0
  Capabilities: pvolume pswitch cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Playback channels: Front Left - Front Right
  Capture channels: Mono
  Limits: Playback 0 - 31
  Mono: Capture [off]
  Front Left: Playback 26 [84%] [4.50dB] [on]
  Front Right: Playback 26 [84%] [4.50dB] [on]
Simple mixer control 'Mono',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
  Playback channels: Mono
  Limits: Playback 0 - 63
  Mono: Playback 58 [92%] [-4.50dB] [off]
Simple mixer control 'Capture',0
  Capabilities: cvolume cswitch penum
  Capture channels: Front Left - Front Right
  Limits: Capture 0 - 15
  Front Left: Capture 15 [100%] [22.50dB] [on]
  Front Right: Capture 15 [100%] [22.50dB] [on]
Simple mixer control 'Mix',0
  Capabilities: cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Capture channels: Mono
  Mono: Capture [off]
Simple mixer control 'Mix Mono',0
  Capabilities: cswitch cswitch-joined cswitch-exclusive penum
  Capture exclusive group: 0
  Capture channels: Mono
  Mono: Capture [off]

P.S. The machine is IBM MT-M 8213 CTO, and to my surprise, at the rear - there were only audio out(green), line in jacks(blue), without mic (tried to connect the mic to line in, no sound from the mic), and the front were only audio out(green) and mic(pink) jacks. When I first installed the machine - I noticed that the inbeded speaker didn't mute, when I connect the headphones, and I had to manualy mute it from the alsamixer controllers (it was the 'mono' controller). I don't know if this has anything to do with the particular problem.

gentisle 08-22-2011 09:54 PM

First of all, does ALL the sound work properly in Windows or have you even loaded Windows on it? If it works properly on Windows or another Linux, then there is something in the configuration of this antares Linux. (That I cannot help you on). You might be able to boot another live distro and test it w/Audacity rather than trying to get Skype running on a live distro. That would at least verify the hardware or not.

Next thing to check would be on your motherboard. Where is that front panel mic connector going to? A correct set of pins on the m/b, or to nowhere, elsewhere? Strange that the back of the cpu has no mic connection. Makes me wonder.

Personally, I'm using LinuxMint 10/amd64-Gnome, and though Skype works, and the sound works in Skype, I have a lot of trouble with the video. I've posted a question here, but got no answer. I've done quite a bit of research on it, but still no way to solve it. The video flickers. But people tell me my sound is great! Wish I could see them clearly. Anyway, hope that helps you figure it out.


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