Set alsa capture on using amixer

[T o n g <mlist4suntong@yahoo.com>]

Hi,

I suddenly can't use my microphone for voice recording any more. I made 
it work before. Now with the same HW and SW, nothing get recorded. (I can 
hear the echo sound from the speaker when speaking to mic). Checking back 
my log, I noticed one difference:

Previously it was:

  $ amixer set Capture '100%'
  Simple mixer control 'Capture',0
    Capabilities: cvolume cswitch
    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]

Now, I can't turn the capture on:

  $ amixer set Capture '100%' on
  Simple mixer control 'Capture',0
    Capabilities: cvolume cswitch
    Capture channels: Front Left - Front Right
    Limits: Capture 0 - 15
    Front Left: Capture 15 [100%] [22.50dB] [off]
    Front Right: Capture 15 [100%] [22.50dB] [off]
                                             ^^^^^

Any way to turn it on? I tried many, nothing worked. 

PS. Here is my Mic setting:

$ amixer get Mic
Simple mixer control 'Mic',0
  Capabilities: pvolume pvolume-joined pswitch pswitch-joined cswitch 
cswitch-exclusive
  Capture exclusive group: 0
  Playback channels: Mono
  Capture channels: Front Left - Front Right
  Limits: Playback 0 - 31
  Mono: Playback 31 [100%] [12.00dB] [on]
  Front Left: Capture [on]
  Front Right: Capture [on]

Does it look right? 

Thanks

-- 
Tong (remove underscore(s) to reply)
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